The Beginning of the End?

From The American Horologist magazine, December 1938...

No Watch Necessary
"The electric clock, once its accuracy is proved, will make all of this anxious watchfulness unnecessary. The special generator by which the clock is actuated produces an alternating current of 100,000 cycles a second, which is "de-multiplied" electrically to provide a 500-cycle supply for the dial.

"The generator is controlled by an oscillating quartz crystal contained in a chamber with a temperature kept constant to one-hundredth of a degree. The probable resultant margin of error is one in 100,000,000."