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 231
Fig. ii.—Rolling-Disc Planimeter, with pure sine movement of the measuring roller. … Fig. 12.—Rolling-Disc Planimeter specially arranged for the evaluation of diagrams with curved ordinates. The displacement of the measuring roller on the disc results from atoothed segment engaging with the rack on the carriage of the measuringroller. This rack may be released and a harmonic lever…
