Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 95
3, alternative racks ; 4, variable cog wheels. 1. The rocking segment is shown in fig. 1. Whilst the segment is turningin the direction shown by the arrow it is in gear with the counter C. Whenturning back again it is thrown out of gear. The angle through which therocking segment can turn is… … Fig. i. handle or by electric power. In the Comptometer the pressing of the keynot only decides the range of the rocking segment, but causes it to rock. 2. The Stepped Reckoner.—The wheel R in fig. 2 is stepped, i.e. the cogsdo not cover its entire length, but some are longer than others. When…
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