History
                                    of the U.S. Telegraph Industry
Tomas Nonnenmacher, Allegheny College
Introduction
The electric telegraph was one of the first telecommunications technologies of the industrial age.
                                    Its immediate predecessors were homing pigeons, visual networks, the Pony Express, and railroads. By transmitting information
                                    quickly over long distances, the telegraph facilitated the growth in the railroads, consolidated financial and commodity markets,
                                    and reduced information costs within and between firms. This entry focuses on the industrial organization of the telegraph
                                    industry from its inception through its demise and the industry's impact on the American economy.
The Development of the Telegraph
The
                                    telegraph was similar to many other inventions of the nineteenth century. It replaced an existing technology, dramatically
                                    reduced costs, was monopolized by a single firm, and ultimately was displaced by a newer technology. Like most radical new
                                    technologies, the telecommunications revolution of the mid-1800s was not a revolution at all, but rather consisted of many
                                    inventions and innovations in both technology and industrial organization. This section is broken into four parts, each reviewing
                                    an era of telegraphy: precursors to the electric telegraph, early industrial organization of the industry, Western Union's
                                    dominance, and the decline of the industry.
Precursors
                                    to the Electric Telegraph
Webster's definition of a telegraph is "an apparatus for
                                    communicating at a distance by coded signals." The earliest telegraph systems consisted of smoke signals, drums, and mirrors
                                    used to reflect sunlight. In order for these systems to work, both parties (the sender and the receiver) needed a method of
                                    interpreting the signals. Henry Wadsworth Longfellow's poem recounting Paul Revere's ride ("One if by land, two if by sea,
                                    and I on the opposite shore will be") gives an example of a simple system. The first extensive telegraph network was the visual
                                    telegraph. In 1791 the Frenchman Claude Chappe used a visual network (which consisted of a telescope, a clock, a codebook,
                                    and black and white panels) to send a message ten miles. He called his invention the télégraphe, or far writer.
                                    Chappe refined and expanded his network, and by 1799 his telegraph consisted of a network of towers with mechanical arms spread
                                    across France. The position of the arms was interpreted using a codebook with over 8,000 entries.
Technological Advances
Due to technological difficulties, the
                                    electric telegraph could not at first compete with the visual telegraph. The basic science of the electric telegraph is to
                                    send an electric current through a wire. Breaking the current in a particular pattern denotes letters or phrases. The Morse
                                    code, named after Samuel Morse, is still used today. For instance, the code for SOS (... --- ...) is a well-known call for
                                    help. Two elements had to be perfected before an electric telegraph could work: a means of sending the signal (generating
                                    and storing electricity) and receiving the signal (recording the breaks in the current).
The
                                    science behind the telegraph dates back at least as far as Roger Bacon's (1220-1292) experiments in magnetism. Numerous small
                                    steps in the science of electricity and magnetism followed. Important inventions include those of Giambattista della Porta
                                    (1558), William Gilbert (1603), Stephen Gray (1729), William Watson (1747), Pieter van Musschenbroek (1754), Luigi Galvani
                                    (1786), Alessandro Giuseppe Antonio Anastasio Volta (1800), André-Marie Ampere (1820), William Sturgeon (1825), and Joseph
                                    Henry (1829). A much longer list could be made, but the point is that no single person can be credited with developing the
                                    necessary technology of the telegraph.
1830-1866:
                                    Development and Consolidation of the Electric Telegraph Industry
In 1832, Samuel Morse
                                    returned to the United States from his artistic studies in Europe. While discussing electricity with fellow passengers, Morse
                                    conceived of the idea of a single-wire electric telegraph. No one until this time had Morse's zeal for the applicability of
                                    electromagnetism to telecommunications or his conviction of its eventual profitability. Morse obtained a patent in the United
                                    States in 1838 but split his patent right to gain the support of influential partners. He obtained a $30,000 grant from Congress
                                    in 1843 to build an experimental line between Baltimore and Washington. The first public message over Morse's line ("What
                                    hath God wrought?") echoed the first message over Chappe's system ("If you succeed, you will bask in glory"). Both indicated
                                    the inventors' convictions about the importance of their systems.
Morse
                                    and His Partners
Morse realized early on that he was incapable of handling the
                                    business end of the telegraph and hired Amos Kendall, a former Postmaster General and a member of Andrew Jackson's "Kitchen
                                    Cabinet," to manage his business affairs. By 1848 Morse had consolidated the partnership to four members. Kendall managed
                                    the three-quarters of the patent belonging to Morse, Leonard Gale, and Alfred Vail. Gale and Vail had helped Morse develop
                                    the telegraph's technology. F.O.J. Smith, a former Maine Representative whose help was instrumental in obtaining the government
                                    grant, decided to retain direct control of his portion of the patent right. The partnership agreement was vague, and led to
                                    discord between Kendall and Smith. Eventually the partners split the patent right geographically. Smith controlled New England,
                                    New York, and the upper-Midwest, and Morse controlled the rest of the country.
The
                                    availability of financing influenced the early industrial organization of the telegraph. Initially, Morse tried to sell his
                                    patent to the government, Kendall, Smith, and several groups of businessmen, but all attempts were unsuccessful. Kendall then
                                    attempted to generate interest in building a unified system across the country. This too failed, leaving Kendall to sell the
                                    patent right piecemeal to regional interests. These lines covered the most potentially profitable routes, emanating from New
                                    York and reaching Washington, Buffalo, Boston and New Orleans. Morse also licensed feeder lines to supply main lines with
                                    business.
Rival Patents
Royal
                                    House and Alexander Bain introduced rival patents in 1846 and 1849. Entrepreneurs constructed competing lines on the major
                                    eastern routes using the new patents. The House device needed a higher quality wire and more insulation as it was a more precise
                                    instrument. It had a keyboard at one end and printed out letters at the other. At its peak, it could send messages considerably
                                    faster than Morse's technique. The Bain device was similar to Morse's, except that instead of creating dots and dashes, it
                                    discolored a piece of chemically treated paper by sending an electric current through it. Neither competitor had success initially,
                                    leading Kendall to underestimate their eventual impact on the market.
By 1851, ten separate
                                    firms ran lines into New York City. There were three competing lines between New York and Philadelphia, three between New
                                    York and Boston, and four between New York and Buffalo. In addition, two lines operated between Philadelphia to Pittsburgh,
                                    two between Buffalo and Chicago, three between points in the Midwest and New Orleans, and entrepreneurs erected lines between
                                    many Midwestern cities. In all, in 1851 the Bureau of the Census reported 75 companies with 21,147 miles of wire.
Multilateral Oligopolies
The telegraph markets in
                                    1850 were multilateral oligopolies. The term "multilateral" means that the production process extended in several directions.
                                    Oligopolies are markets in which a small number of firms strategically interact. Telegraph firms competed against rivals on
                                    the same route, but sought alliances with firms with which they connected. For example, four firms (New York, Albany &
                                    Buffalo; New York State Printing; Merchants' State; and New York and Erie) competed on the route between New York City and
                                    Buffalo. Rates fell dramatically (by more than 50%) as new firms entered, so this market was quite competitive for a while.
                                    But each of these firms sought to create an alliance with connecting firms, such as those with lines from New York City to
                                    Boston or Washington. Increased business from exchanging messages meant increased profitability.
Mistransmission Problems
Quality competition was
                                    also fierce, with the line that erected the best infrastructure and supplied the fastest service usually dominating other,
                                    less capable firms. Messages could easily be garbled, and given the predominately business-related use of the telegraph, a
                                    garbled message was often worse than no message at all. A message sent from Boston to St. Louis could have traveled over the
                                    lines of five firms. Due to the complexity of the production process, messages were also often lost, with no firm taking responsibility
                                    for the mistransmission. This lack of responsibility gave firms an incentive to provide a lower quality service compared to
                                    an integrated network. These issues ultimately contributed to the consolidation of the industry.
Horizontal and System Integration
Horizontal integration-integration
                                    between two competing firms-and system integration-integration between two connecting firms-occurred in the telegraph industry
                                    during different periods. System integration occurred between 1846 and 1852, as main lines acquired most of the feeder lines
                                    in the country. In 1852 the Supreme Court declared the Bain telegraph an infringement on Morse's patent, and Bain lines merged
                                    with Morse lines across the country. Between 1853 and 1857 regional monopolies formed and signed the "Treaty of Six Nations,"
                                    a pooling agreement between the six largest regional firms. During this phase the industry experienced both horizontal and
                                    system integration. By the end of the period, most remaining firms were regional monopolists, controlled several large cities
                                    and owned both the House and the Morse patents. Figure 1 shows the locations of these firms.
Figure 1: Treaty of Six Nations
 
Source: Thompson, p. 315
The final phase of
                                    integration occurred between 1857 and 1866. In this period the pool members consolidated into a national monopoly. By 1864
                                    only Western Union and the American Telegraph Company remained of the "Six Nations." The United States Telegraph Company entered
                                    the field by consolidating smaller, independent firms in the early 1860s, and operated in the territory of both the American
                                    Telegraph Company and Western Union. By 1866 Western Union absorbed its last two competitors and reached its position of market
                                    dominance.
Efficiency versus Market Power
Horizontal and system integration had two causes: efficiency and market power. Horizontal integration created economies
                                    of scale that could be realized from placing all of the wires between two cities on the same route or all the offices in a
                                    city in the same location. This consolidation reduced the cost of maintaining multiple lines. The reduction in competition
                                    due to horizontal integration also allowed firms to charge a higher price and earn monopoly profits. The efficiency gain from
                                    system integration was better control of messages travelling long distances. With responsibility for the message placed clearly
                                    in the hands of one firm, messages were transmitted with more care. System integration also created monopoly power, since
                                    to compete with a large incumbent system, a new entrant would have to also create a large infrastructure.
1866-1900: Western Union's Dominance
The
                                    period from 1866 through the turn of the century was the apex of Western Union's power. Yearly messages sent over its lines
                                    increased from 5.8 million in 1867 to 63.2 million in 1900. Over the same period, transmission rates fell from an average
                                    of $1.09 to 30 cents per message. Even with these lower prices, roughly 30 to 40 cents of every dollar of revenue were net
                                    profit for the company. Western Union faced three threats during this period: increased government regulation, new entrants
                                    into the field of telegraphy, and new competition from the telephone. The last two were the most important to the company's
                                    future profitability.
Western Union Fends off Regulation
Western Union was the first nationwide industrial monopoly, with over 90% of the market share and dominance in every
                                    state. The states and the federal government responded to this market power. State regulation was largely futile given the
                                    interstate character of the industry. On the federal level, bills were introduced in almost every session of Congress calling
                                    for either regulation of or government entry into the industry. Western Union's lobby was able to block almost any legislation.
                                    The few regulations that were passed either helped Western Union maintain its control over the market or were never enforced.
Western Union's Smaller Rivals
Western
                                    Union's first rival was the Atlantic and Pacific Telegraph Company, a conglomeration of new and merged lines created by Jay
                                    Gould in 1874. Gould sought to wrest control of Western Union from the Vanderbilts, and he succeeded in 1881 when the two
                                    firms merged. A more permanent rival appeared in the 1880s in the form of the Postal Telegraph Company. John Mackay, who had
                                    already made a fortune at the Comstock Lode, headed this firm. Mackay did what many of his telegraph predecessors did in the
                                    1850s: create a network by buying out existing bankrupt firms and merging them into a network with large enough economies
                                    of scale to compete with Western Union. Postal never challenged Western Union's market dominance, but did control over 10-20%
                                    of the market at various times.
The Threat from the Telephone
Western Union's greatest threat came from a new technology, the telephone. Alexander Graham Bell
                                    patented the telephone in 1876, initially referring to it as a "talking telegraph." Bell offered Western Union the patent
                                    for the telephone for $100,000, but the company declined to purchase it. Western Union could have easily gained control of
                                    AT&T in the 1890s, but management decided that higher dividends were more important than expansion. The telephone was
                                    used in the 1880s only for local calling, but with the development in the 1890s of "long lines," the telephone offered increased
                                    competition to the telegraph. In 1900, local calls accounted for 97% of the telephone's business, and it was not until the
                                    twentieth century that the telephone fully displaced the telegraph.
1900-1988: Increased Competition and Decline
The
                                    twentieth century saw the continued rise of the telephone and decline of the telegraph. Telegraphy continued to have a niche
                                    in inexpensive long-distance and international communication, including teletypewriters, Telex, and stock ticker. As shown
                                    in Table 1, after 1900, the rise in telegraph traffic slowed, and after 1930, the number of messages sent began to decline.
Table 1: Messages Handled by the Telegraph Network: 1870-1970
Date  | Messages Handled  | Date  | Messages Handled  | 
1870  | 9,158,000  | 1930  | 211,971,000  | 
1880  | 29,216,000  | 1940  | 191,645,000  | 
1890  | 55,879,000  | 1945  | 236,169,000  | 
1900  | 63,168,000  | 1950  | 178,904,000  | 
1910  | 75,135,000  | 1960  | 124,319,000  | 
1920  | 155,884,000  | 1970  | 69,679,000  | 
Source: Historical Statistics.
Notes: Western Union messages 1870-1910;
                                    all telegraph companies, 1920-1970.
AT&T Obtains Western Union,
                                    Then Gives It Up
In 1909, AT&T gained control of Western Union by purchasing
                                    30% of its stock. In many ways, the companies were heading in opposite directions. AT&T was expanding rapidly, while Western
                                    Union was content to reap handsome profits and issue large dividends but not reinvest in itself. Under AT&T's ownership,
                                    Western Union was revitalized, but the two companies separated in 1913, succumbing to pressure from the Department of Justice.
                                    In 1911, the Department of Justice successfully used the Sherman Antitrust Act to force a breakup of Standard Oil. This success
                                    made the threat of antitrust action against AT&T very credible. Both Postal Telegraph and the independent telephone companies
                                    wishing to interconnect with AT&T lobbied for government regulation. In order to forestall any such government action,
                                    AT&T issued the "Kingsbury Commitment," a unilateral commitment to divest itself of Western Union and allow independent
                                    telephone firms to interconnect.
Decline of the Telegraph
The telegraph flourished in the 1920s, but the Great Depression hit the industry hard, and it never
                                    recovered to its previous position. AT&T introduced the teletypewriter exchange service in 1931. The teletypewriter and
                                    the Telex allowed customers to install a machine on their premises that would send and receive messages directly. In 1938,
                                    AT&T had 18%, Postal 15% and Western Union 64% of telegraph traffic. In 1945, 236 million domestic messages were sent,
                                    generating $182 million in revenues. This was the most messages sent in a year over the telegraph network in the United States.
                                    By that time, Western Union had incorporated over 540 telegraph and cable companies into its system. The last important merger
                                    was between Western Union and Postal, which occurred in 1945. This final merger was not enough to stop the continuing rise
                                    of the telephone or the telegraph's decline. Already in 1945, AT&T's revenues and transmission dwarfed those of Western
                                    Union. AT&T made $1.9 billion in yearly revenues by transmitting 89.4 million local phone calls and 4.9 million toll calls
                                    daily. Table 2 shows the increasing competitiveness of telephone rates with telegraph rates.
Table 2: Telegraph and Telephone Rates from New York City to Chicago: 1850-1970
Date  | Telegraph*  | Telephone**  | 
1850  | $1.55  | 
 
  | 
1870  | 1.00  | 
 
  | 
1890  | .40  | 
 
  | 
1902  | 
 
  | 5.45  | 
1919  | .60  | 4.65  | 
1950  | .75  | 1.50  | 
1960  | 1.45  | 1.45  | 
1970  | 2.25  | 1.05  | 
Source: Historical Statistics.
Notes: * Beginning 1960,
                                    for 15 word message. Prior to 1960 for 10 word message. ** Rates for station-to station, daytime, 3-minute call
The Effects of the Telegraph
The
                                    travel time from New York City to Cleveland in 1800 was two weeks, with another four weeks necessary to reach Chicago. By
                                    1830, those travel times had fallen in half, and by 1860 it took only two days to reach Chicago from New York City. However,
                                    by use of the telegraph, news could travel between those two cities almost instantaneously. This section examines three instances
                                    where the telegraph affected economic growth: railroads, high throughput firms, and financial markets.
Telegraphs and Railroads
The telegraph and the railroad
                                    were natural partners in commerce. The telegraph needed the right of way that the railroads provided and the railroads needed
                                    the telegraph to coordinate the arrival and departure of trains. These synergies were not immediately recognized. Only in
                                    1851 did railways start to use telegraphy. Prior to that, telegraph wires strung along the tracks were seen as a nuisance,
                                    occasionally sagging and causing accidents and even fatalities.
The greatest savings
                                    of the telegraph were from the continued use of single-tracked railroad lines. Prior to 1851, the U.S. system was single-tracked,
                                    and trains ran on a time-interval system. Two types of accidents could occur. Trains running in opposite directions could
                                    run into one another, as could trains running in the same direction. The potential for accidents required that railroad managers
                                    be very careful in dispatching trains. One way to reduce the number of accidents would have been to double-track the system.
                                    A second, better, way was to use the telegraph.
Double-tracking was a good alternative,
                                    but not perfect. Double-tracked lines would eliminate head-on collisions, but not same direction ones. This would still need
                                    to be done using a timing system, i.e. requiring a time interval between departing trains. Accidents were still possible using
                                    this system. By using the telegraph, station managers knew exactly what trains were on the tracks under their supervision.
                                    Double-tracking the U.S. rail system in 1893 has been estimated to cost $957 million. Western Union's book capitalization
                                    was $123 million in 1893, making this seem like a good investment. Of course, the railroads could have used a system like
                                    Chappe's visual telegraph to coordinate traffic, but such a system would have been less reliable and would not have been able
                                    to handle the same volume of traffic.
Telegraph and Perishable Products
                                    Industries
Other industries that had a high inventory turnover also benefited from the
                                    telegraph. Of particular importance were industries in which the product was perishable. These industries included meatpacking
                                    and the distribution of fruits and vegetables. The growth of both of these industries was facilitated by the introduction
                                    of the refrigerated car in 1874. The telegraph was required for the exact control of shipments. For instance, refrigeration
                                    and the telegraph allowed for the slaughter and disassembly of livestock in the giant stockyards of Chicago, Kansas City,
                                    St. Louis and Omaha. Beef would then be shipped east at a cost of 50% that of shipping the live cattle. The centralization
                                    of the stockyards also created tremendous amounts of by-products that could be processed into glue, tallow, dye, fertilizer,
                                    feed, brushes, false teeth, gelatin, oleomargarine, and many other useful products.
Telegraph and Financial Markets
The telegraph undoubtedly had a major
                                    impact on the structure of financial markets in the United States. New York became the financial center of the country, setting
                                    prices for a variety of commodities and financial instruments. Among these were beef, corn, wheat, stocks and bonds. As the
                                    telegraph spread, so too did the centralization of prices. For instance, in 1846, wheat and corn prices in Buffalo lagged
                                    four days behind those in New York City. In 1848, the two markets were linked telegraphically and prices were set simultaneously.
The centralization of stock prices helped make New York the financial capital of the United States.
                                    Over the course of the nineteenth century, hundreds of exchanges appeared and then disappeared across the country. Few of
                                    them remained, with only those in New York, Philadelphia, Boston, Chicago and San Francisco achieving any permanence. By 1910,
                                    90 percent of all bond and two-thirds of all stock trades occurred on the New York Stock Exchange.
Centralization of the market created much more liquidity for stockholders. As the number of potential traders increased,
                                    so too did the ability to find a buyer or seller of a financial instrument. This increase in liquidity may have led to an
                                    increase in the total amount invested in the market, therefore leading to higher levels of investment and economic growth.
                                    Centralization may also have led to the development of certain financial institutions that could not have been developed otherwise.
                                    Although difficult to quantify, these aspects of centralization certainly had a positive effect on economic growth.
In some respects, we may tend to overestimate the telegraph's influence on the economy. The rapid
                                    distribution of information may have had a collective action problem associated with it. If no one else in Buffalo has a piece
                                    of information, such as the change in the price of wheat in New York City, then there is a large private incentive to discover
                                    that piece of information quickly. But once everyone has the information, no one made better off. A great deal of effort may
                                    have been spent on an endeavor that, from society's perspective, did not increase overall efficiency. The centralization in
                                    New York also increased the gains from other wealth-neutral or wealth-reducing activities, such as speculation and market
                                    manipulation. Higher volumes of trading increased the payoff from the successful manipulation of a market, yet did not increase
                                    society's wealth.
Conclusion
The telegraph accelerated the speed of business transactions during the late nineteenth century
                                    and contributed to the industrialization of the United States. Like most industries, it faced new competition that ultimately
                                    proved its downfall. The telephone was easier and faster to use, and the telegraph ultimately lost its cost-advantages. In
                                    1988, Western Union divested itself of its telegraph infrastructure and focused on financial services, such as money orders.
                                    A Western Union telegram is still available, currently costing $9.95 for 250 words.
Telegraph Timeline
1837  | Cooke and Wheatstone patent telegraph in England.  | 
1838  | Morse's
                                    Electro-Magnetic Telegraph patent approved.  | 
1843  | First message sent between Washington
                                    and Baltimore.  | 
1846  | First commercial telegraph line completed. The Magnetic
                                    Telegraph Company's lines ran from New York to Washington.  | 
 
  | House's Printing Telegraph patent approved.  | 
1848  | Associated Press formed to pool telegraph
                                    traffic.  | 
1849  | Bain's Electro-Chemical patent approved.  | 
1851  | Hiram Sibley and associates incorporate New York and Mississippi Valley Printing Telegraph Company. Later became Western
                                    Union.  | 
1851  | Telegraph first used to coordinate train departures.  | 
1857  | Treaty of Six Nations is signed, creating a national cartel  | 
1859  | First transatlantic
                                    cable is laid from Newfoundland to Valentia, Ireland. Fails after 23 days, having been used to send a total of 4,359 words.
                                    Total cost of laying the line was $1.2 million.  | 
1861  | First Transcontinental telegraph completed.  | 
1866  | First successful transatlantic telegraph laid  | 
 
  | Western Union merges with major remaining rivals.  | 
1867  | Stock ticker service inaugurated.  | 
1870  | Western Union introduces the money order service.  | 
1876  | Alexander
                                    Graham Bell patents the telephone.  | 
1908  | AT&T gains control of Western Union.
                                    Divests itself of Western Union in 1913.  | 
1924  | AT&T offers Teletype system.  | 
1926  | Inauguration of the direct stock ticker circuit from New York to San Francisco.  | 
1930  | High-speed tickers can print 500 words per minute.  | 
1945  | Western
                                    Union and Postal Telegraph Company merge.  | 
1962  | Western Union offers Telex for international
                                    teleprinting.  | 
1974  | Western Union places Westar satellite in operation.  | 
1988  | Western Union Telegraph Company reorganized as Western Union Corporation. The telecommunications assets were divested
                                    and Western Union focuses on money transfers and loan services.  | 
References
Blondheim, Menahem. News
                                    over the Wires. Cambridge: Harvard University Press, 1994.
Brock, Gerald. The
                                    Telecommunications Industry. Cambridge: Harvard University Press, 1981.
DuBoff,
                                    Richard. "Business Demand and the Development of the Telegraph in the United States, 1844-1860." Business History
                                    Review 54 (1980): 461-477.
Field, Alexander. "The Telegraphic Transmission
                                    of Financial Asset Prices and Orders to Trade: Implications for Economic Growth, Trading Volume, and Securities Market Regulation." Research
                                    in Economic History 18 (1998).
Field, Alexander. "French Optical Telegraphy,
                                    1793-1855: Hardware, Software, Administration." Technology and Culture 35 (1994): 315-47.
Field, Alexander. "The Magnetic Telegraph, Price and Quantity Data, and the New Management of Capital." Journal
                                    of Economic History 52 (1992): 401-13.
Gabler, Edwin. The American Telegrapher:
                                    A Social History 1860-1900. New Brunswick: Rutgers University Press, 1988.
Goldin,
                                    H. H. "Governmental Policy and the Domestic Telegraph Industry." Journal of Economic History 7 (1947): 53-68.
Israel, Paul. From Machine Shop to Industrial Laboratory. Baltimore: Johns Hopkins,
                                    1992.
Lefferts, Marshall. "The Electric Telegraph: its Influence and Geographical
                                    Distribution." American Geographical and Statistical Society Bulletin, II (1857).
Nonnenmacher, Tomas. "State Promotion and Regulation of the Telegraph Industry, 1845-1860." Journal of Economic
                                    History 61 (2001).
Oslin, George. The Story of Telecommunications.
                                    Macon: Mercer University Press, 1992.
Reid, James. The Telegraph in America.
                                    New York: Polhemus, 1886.
Thompson, Robert. Wiring a Continent, Princeton:
                                    Princeton University Press, 1947.
U.S. Bureau of the Census. Report of the Superintendent
                                    of the Census for December 1, 1852, Washington: Robert Armstrong, 1853.
U.S.
                                    Bureau of the Census. Historical Statistics of the United States: Colonial Times to 1970: Bicentennial Edition,
                                    Washington: GPO, 1976.
Yates, JoAnne. "The Telegraph's Effect on Nineteenth Century
                                    Markets and Firms." Business and Economic History 15