The Electronic Computers, Part 4: The Electronic Revolution

We have now recounted, in succession, each of the first three attempts to build a digital, electronic computer: The Atanasoff-Berry Computer (ABC) conceived by John Atanasoff, the British Colossus projected headed by Tommy Flowers, and the ENIAC built at the University of Pennsylvania's Moore School. All three projects were effectively independent creations. Though John Mauchly, the motive force…

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The Electronic Age

We saw last time how the first generation of digital computers were built around the first generation of automatic electrical switch, the electromagnetic relay. But by the time those computers were built, another digital switch was already waiting in the wings. Whereas the relay was an electromechanical device (because it used electricity to control a mechanical…

Lost Generation: The Relay Computers

Our previous installment described the rise of automatic telephone switches, and of the complex relay circuits to control them. Now we shall see how scientists and engineers  developed such relay circuits into the first, lost, generation of digital computers. The Relay at Zenith Recall to mind the relay, based on the simple idea that an electromagnet could operate a…

Only Connect

The first telephones [Previous Part] were point-to-point devices, connecting a single pair of stations. As early as 1877, however, Alexander Graham Bell envisioned a grand, interconnected system. Bell wrote in a prospectus for potential inventors that, just as municipal gas and water systems connected homes and offices throughout major cities to central distribution centers,1 ...it is conceivable that cables…

The Speaking Telegraph

[Previous Part] The telephone was an accident. Whereas the telegraph networks of the 1840s emerged out of a century-long search for the means to communicate by electricity, men only stumbled over the telephone while searching for a better telegraph. For this reason, it is easier to pin down a plausible, though not incontrovertible, date for the invention of the…

The Relay

[Previous Part] In 1837, American scientist and teacher Joseph Henry took his first tour of Europe. During his visit to London, he made a point of visiting a man he greatly admired, the mathematician Charles Babbage. Accompanying Henry were his friend Alexander Bache, and his new acquaintance and fellow experimenter in telegraphy, Charles Wheatstone. Babbage told his…

The Entrepreneurs

In our last installment, we saw how the component parts that could be used to build an electromagnetic telegraph came into being. Now let us see how they were put together. The Time Ripens By the 1830s, the time was ripe for the development of the telegraph on a large scale. In the U.S. and Britain, the age…