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 238
Fig. 7. The instrument is constrained to move in a straight line by a guide bar.The axis XX corresponds to the circular path of the outer end of the polearm in a polar planimeter. In effect, this machine is equivalent to a polarplanimeter with an infinitely long radial arm. … Fig. 8. A modern planimeter whose working principle is the same as that of theearliest forms is illustrated diagrammatically in fig. 8. 14 210 SECTION G This machine was designed by Mr W. R. Whiting. It is guided along astraight edge, two small vertical rollers being fitted at the corners of…
