Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 206
739. POCKET ELECTRIC LIGHT. - A dry battery, with a smallmcandescent 1 amp connected with it by a break-piece operated by the thumb. A small lens at thefront protects the lamp and con-centrates the light. Gives aconstant light for several hours.Battery easily renewed.
Mechanical movements
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