Five hundred and seven mechanical movements (1903)
Brown, Henry T. [from old catalog] · New York, Brown & Seward · leaf 103
capementfor watches. In this escapement two bal-ance-wheels are employed, carried by thesame driving-power, but oscillating in op-posite directions, for the purpose of coun-teracting the effect of any sudden jar upona watch or time-piece. The jar which wouldaccelerate motion of one wheel would… … 406
Mechanical movements
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