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By the 1920s, battery holders used twin metal clips (like fuse holders) to hold the battery in place while making electrical contact. Patent no. 1439429 was granted in Dec. 1922 for an assembly with two spring arm clips, a small switch, and a lamp assembly on the end of connected wires.
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...
One of the gears turning the clock's hands has a shaft with a sliding friction fitting, so the clock's hands can be turned manually by a knob on the back or on the bottom, to set the clock. Synchronous motor clocks are rugged because they do not have a delicate pendulum or balance wheel.
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.
204.911 (replacement for the 204.901 upgrading from a capacitor to a rechargeable battery) 205.111 (discontinued and replaced by the 205.911 which upgraded from a capacitor to a rechargeable battery) 205.711 (15 jeweled movement used only by Swatch Watch for a variety of its fashion watches)
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The movements were mounted in cases of various designs, often in case styles similar to those of companies like Seth Thomas and E. Howard. [4] The SWCC appears to have been manufacturing their own clock movements by 1892, for they are all stamped "Self Winding Clock Co". Earlier movements were stamped with Seth Thomas or E. Howard markings. [5]
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