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 117
curved slot is cut in these guide-plates which is con-centric with the point of oscillation of the lever A. Into this slot fits aprojection from the top of the rack B, and as the other end of this rack issecured to the lever A, any possible motion up and down between its guide-plates is a true… … Fig. 31. pressed, the corresponding wire moves to the left, and its bent-in end ispulled to the bottom of its slot, in which position it catches the projectionshown at the top of the sector B, and thus limits its possible downwardmovement. With the rack thus arrested the other end of the lever A…
