Electric watches in 19th century

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The Elgin National Watch Company and the Hamilton Watch Company pioneered the first electric watch. The first electric powered moves used a battery as a strength supply to oscillate the stability wheel. During the 1950s Elgin evolved the version 725 at the same time as Hamilton released  fashions: the primary, the Hamilton 500, released on three January 1957, became produced into 1959. This model had troubles with the contact wires misaligning, and the watches again to Hamilton for alignment. The Hamilton 505, an development at the 500, proved greater reliable: the contact wires had been eliminated and a non-adjustable touch at the stability meeting introduced the energy to the balance wheel. Similar designs from many other watch groups accompanied. Another sort of electric powered watch was advanced by using the Bulova company that used a tuning-fork resonator in place of a traditional stability wheel to increase timekeeping accuracy, shifting from a normal 2.5–4 Hz with a traditional stability wheel to 360 Hz with the tuning-fork design.