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. 5. INSTRUMENTS OF CALCULATION 209 made, and so any error due to improper mounting of the recording wheelcan be eliminated. Another type of Amsler planimeter is illustrated in fig. 6. The advantageof this type lies in the fact that the recording wheel works on a revolving disc … 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-
