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. 6. instead of on the surface of the drawing, thus ensuring greater accuracy whenmeasuring drawings which have been creased through folding. A modification of the polar planimeter is illustrated diagrammatically in fig- 7- … 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.
