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 260
ENTS OF CALCULATION 231 curve. As the planimeter does not distinguish between positive and negative areas, the baseline must be so arranged that the ordinate y is always positive. The corresponding area requires to be determined when the line PQ is inclined at an angle n0-\— to the 0-axis instead… … Fig. 6. The essential parts of the apparatus consist of two rods at right anglesto each other. One of these is fixed and forms the _y-axis, while one end ofthe other is capable of moving along the first. PR is part of this latter rod,and at P, the tracing point, there is an arrangement by which,…
