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Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in construcive and operative mechinery and the mechanical arts, being practically a mechanical dictionary (1917)

Hiscox, Gardner Dexter, 1822?-1908 · New York : The Norman W. Henley publishing co. · leaf 204

An illustration from Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in construcive and operative mechinery and the mechanical arts, being practically a mechanical dictionary, 1917, leaf 204
739. POCKET ELECTRIC LIGHT.-A dry battery, with a smallincandescent lamp 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. … ^1!^

Mechanical movements

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