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 280
s are chosen so that if one revolution of the common shaft correspondsto one day, then the number of revolutions made by the upper wheel is aclose approximation to the true frequency of this component. Each pair of wheels has a large pulley above it, and the rotation of theupper wheel is arranged… … Fig. i. rod, is constrained by guides to move vertically. Consequently the pulleyis moved up and down as the pin revolves with its wheel and movesthe link. The pulleys are placed alternately high and low, and a continuous finewire passes under and over them. The wire is fixed at its left extremity…
