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Battery types such as the 9-volt have snap-on contacts. Battery holders for zinc-air batteries must not be completely air-tight since approximately 1 litre of air is required per ampere-hour of discharge per cell. The battery holder may include a valve integrated with the device power switch to allow air to be admitted when the device is ...
Balance wheel in a 1950s alarm clock, the Apollo, by Lux Mfg. Co. showing the balance spring (1) and regulator (2) Modern balance wheel in a watch movement A balance wheel , or balance , is the timekeeping device used in mechanical watches and small clocks , analogous to the pendulum in a pendulum clock .
This movement, with minor modifications, was used for the next 60 plus years. In this design, the motor proved to be much more reliable and was now an integral part of the movement rather than added on below the clock works. The "F" movement motor employed a vibrating up and down motion rather than rotary motion to re-wind the mainspring.
A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threaded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.
The Autoquartz movement used by Tissot is gold plated and carries the designation ETA 205.914. [citation needed] Movement calibers: [citation needed] 204.901 (small 8.75 lignes used primarily in women's watches) 204.911 (replacement for the 204.901 upgrading from a capacitor to a rechargeable battery)
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