Warren Marrison

Marrison was born in Inverary, Frontenac county, Ontario. his studies were interrupted by World War I when he served in the Royal Flying Corps as a radio technician. Beginning in 1921, he studied at Harvard University, ultimately receiving a master's degree. He worked at first for Western Electric in New York City, but moved to Bell Laboratories in New York beginning in 1925. ==Quartz clock==

At Bell Labs in New York, Marrison was working on frequency standards using quartz as a reference. It was in 1927 that he developed the first quartz clock while working with J.W. Horton. The clock used a block of crystal, stimulated by electricity, to produce pulses at a frequency of 50,000 cycles per second. A submultiple controlled frequency generator then divided this down to a usable, regular pulse that drove a synchronous motor. ==Legacy and awards==

The invention would lead AT&T, the subsequent owners of Bell Labs, to develop a timepiece division called Frequency Control Products. This would eventually become the company Vectron International. In 1955 the Clockmakers Company awarded him the Tompion Medal. == References ==