By Ian Graham
Displaying how wheels aid issues stream, the diversities among gas and diesel gas, and what a locomotive's insides appear like, a full-color creation to land machines good points medical reasons and experiments and actions.
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Additional info for Cars, Bikes, Trains, and Other Land Machines (How Things Work)
Example text
BUSY SIGNALS Bell’s telephone worked by causing an electrical current to flow from the speaker’s end of the telephone, the transmitter, to the listener’s end, the receiver. Unfortunately, he’d designed it so that the strength of the signal came from the volume of the speaker’s voice. That’s why users often had to shout. Edison came up with the idea of using a battery to provide a current on the line that could then be altered just slightly by a person speaking in a regular voice. That small change made a big difference.
Stories about Edison’s amazing invention, many of them inaccurate, have been leaking for weeks, and the people waiting in the cold for the midnight spectacular share them eagerly. There’s a rumor that Edison’s toughest critic, the respected engineering professor Henry Morton, is coming to see the demonstration for himself. Just the other day Morton denounced Edison in the New York Times. Edison promises a light that will be ten times stronger than a gas streetlight, but Morton believes it will at best merely equal a gaslight.
You’d be dissatisfied with it, and maybe you’d be determined to make something better. By the 1870s, Edison and other inventors felt that way about their wired world. Just like the people building the modern Internet, nineteenth-century inventors were obsessed with finding the Next Big Thing. On this day Edison has found it. SOUND AND FURY Several inventors have been trying to send sound over the wires that are now strung across the world. A few are already claiming to have done it. Not quite two years earlier Alexander Graham Bell spoke his famous words to his assistant, “Mr.