United States · Working quartz clock demonstrated by Marrison and Horton in 1927; Marrison's related patent filings followed in the early 1930s
Quartz Crystal Resonator for Timekeeping
Partially verifiedThe quartz resonator principle developed by Marrison and Horton is the direct technical ancestor of virtually all modern quartz wristwatches and clocks, representing the most consequential timekeeping technology shift since the mechanical escapement.
Marrison and Horton built the first quartz-crystal clock at Bell Telephone Laboratories in 1927, using the highly stable mechanical resonance of an electrically driven quartz crystal as the timekeeping element in place of a pendulum or balance.
Quartz clocks of this kind quickly exceeded the accuracy of the best pendulum clocks and became laboratory and observatory time standards through the mid-twentieth century, before quartz oscillators were later miniaturised for wristwatch use from the late 1960s onward (notably by Seiko's Astron in 1969).
How to verify this yourself
Marrison's own account was published in the Bell System Technical Journal; specific patent numbers associated with his and Horton's work should be confirmed directly against the US Patent and Trademark Office's historical records by inventor name and 1927–1930s filing dates rather than assumed from secondary popular retellings.
Manufacturers known to have used it
- Seiko (first commercial quartz wristwatch, 1969)
- essentially all subsequent quartz watch and clock manufacturers
Sources & references
- Marrison, W. A., 'The Evolution of the Quartz Crystal Clock', Bell System Technical Journal (1948), a retrospective account by the inventor
- Seiko Museum, published history of the Seiko Astron and quartz development
Where sources disagree, the disagreement is stated rather than resolved silently.