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 232
he 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 closed so that the INSTRUMENTS OF CALCULATION 203… … Fig. 13.—Compensating Planimeter Pandero. Needle-pole Compensating Planimeter with short, graduated tracer arm,adjustable within a narrow limit ; as a rule set for the vernier unit -i sq. cm.(By computing figures drawn to a definite scale the area is obtained bymultiplying the reading of the roller…
