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guard during the heady times of telephony s arrival is unparalleled. He observes that America was a bit of a backwater as far as science went. The inventive climate of that early part of the century was largely [focused on] mechanical inventions, he notes. Even the early electrical stuff was basically mechanical and the machine shop was the center of inventive activity. With the invention of the telegraph, which occurred simultaneously in the United States, England, and Germany in the 1830s, it became possible to communicate immediately across significant distances. By the second half of the 19th Century, three individuals were working on practical applications of Faraday s observations. Alexander Graham Bell, a speech teacher for the hearing impaired, and a part-time inventor; Elisha Gray, the inventor of the telegraph, and an employee of Western Electric; and Thomas Edison, an inventor and former employee of Western Union, were all working on the same problem: how to send multiple simultaneous messages across a single pair of wires. All three invented devices that they called harmonic telegraphs; they were nothing more than frequency division multiplexers, but for the time were remarkably advanced conceptually. The original devices that they created performed the multiplexing task mechanically by vibrating metallic reeds at different frequencies. The frequencies would pass down the line and be received correctly at the other end. The only problem with this technique was channel separation; because the frequency bands were relatively close to each other, they would eventually interfere with one another, causing problems at the receiving end of the circuit. For a telegraph, harmonic multiplexing was deemed to not be practical. All three inventors Gray, Edison, and Bell were in a dead heat to create the first device that would transport voice across a long-distance network. None of them had really tested their inventions extensively; they had been used in the laboratory only. Nevertheless, on February 14, 1876, Alexander Graham Bell filed a notice of invention on his own untested device. Simultaneously, Elisha Gray filed a notice of invention on his device. Some argument exists as to who filed first; many believe that Gray actually filed first. Whatever the case, three days later Bell became the first person to transmit voice electronically across a network. And in 1877, following numerous experiments and tweaks to his original device, Bell founded the Bell Telephone Company. Meanwhile, Thomas Edison continued to work on his own device, patented in 1875 and in 1876 was hired by Western Union. The arrival of the telephone was seen as a major problem by the company, but they
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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had no intention of sitting idly by while Gray and Bell destroyed their business with their new-fangled invention. In 1877, Edison crafted a very good transmitter based on compressed carbon powder (still in widespread use today, by the way; see Figure 3-3) that would eventually replace the far less capable transmitter invented by Bell. For the experimenters among the readers out there, it s a fun exercise to build a compressed carbon microphone, as shown in Figure 3-4. In a mortar and pestle (OK, a plastic bag and a hammer), grind two charcoal briquettes to a fine powder. Pour the powder into a jar lid until the powder is even with the lip of the lid. Stretch a piece of plastic wrap tightly over the lid and secure it with a rubber band. Next, drill a hole in each side of the lid and insert an insulated wire that has been stripped back about a half-inch to expose the copper wire. Next, connect the wires to a speaker and battery, as shown in the illustration. When you speak into
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