electric watch การใช้

Button cells are commonly used in electric watches, clocks, and timers.
In 1957, Hamilton introduced the world's first electric watch, the Hamilton Electric 500.
He designed asymmetrical cases for the new Hamilton electric watches in the 1950s, including such notable models as the Ventura, Everest, and Pacer.
In 1962, Hamilton entered into a joint venture ( 60 % owned by Hamilton ) with the Japanese watchmaking firm Ricoh to produce electric watches meant primarily for the Japanese market.
A weak point in early balance wheel electric watches was the switch contacts on the balance wheel, which turned the solenoid on briefly to provide the impulse to keep the wheel oscillating.