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The Early KeyDriven Art
The KeyDriven Calculator
Early Efforts in the Recording Machine Art
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adding machine adding mechanism adding the multiple applied arranged Barbour Bollee Bouchet Burroughs patent Burroughs recorder carriage carrying lever carrying mechanism cash register chine ciphers co-acting combination construction crank denominational actuators detent disclosed drum engage error feature Felt patent Felt recorder Felt's figures gear racks Gottfried Wilhelm Leibnitz higher wheel Hill machine ink-ribbon invention inventors key depression key Locked key-action key-driven calculating machine key-driven machine key-set key-stroke keyboard lever G locked lower wheel manipulation marked motion multiple-order key-driven Napier's Bones nine-tooth gear normal numeral wheels old Comptometer operator paper Parmelee patent drawings patent issued pinion pivoted platen Pottin prime actuation printing ratchet device ratchet pawl recording machine recording-adding machine Robjohn rotation scheme shaft shown in Fig spring stop Swalm teeth tens tion tiples tooth total wheels transfer device trigger latches type sector type-wheels typewriter U. S. Patent Office units wheel zeroized