Chapter 3

The audio patents

By late 1928, Standard Telephones & Cables had certainly had their worth out of Alan Blumlein. He had applied for seven patents during his time with them, invented an entire signalling system, improved several elements of their submarine cabling system and designed various electrical circuits. Most notable of these was the AC bridge circuit of course, and all of which would earn ST&C money for many years to come. However, Alan Blumlein was restless, perhaps even bored.

There is no way of knowing now, at this distance, exactly when and why Alan Blumlein made up his mind that it was time for a change of direction and career. Suffice to say that, by the end of 1928, he felt (even if his employers did not) that he had ...

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