. Graphical and mechanical computation . Fig. 107/. constrained to move in a straight line instead of in a circle. Planimetersof the linear type form part of the integrators described in Art. 108. Various other types of planimetershave been constructed, which do nothave an integrating wheel. One of thebest known of these is that of Prytz,also known as the hatchet In this form of the instrument(Fig. 107^) the end Q forms a knife-edge so that Q can only move freelyalong the line PQ. When P traces thegiven curve, Q will describe a curve such that PQ is always tangent to it. * For a
. Graphical and mechanical computation . Fig. 107/. constrained to move in a straight line instead of in a circle. Planimetersof the linear type form part of the integrators described in Art. 108. Various other types of planimetershave been constructed, which do nothave an integrating wheel. One of thebest known of these is that of Prytz,also known as the hatchet In this form of the instrument(Fig. 107^) the end Q forms a knife-edge so that Q can only move freelyalong the line PQ. When P traces thegiven curve, Q will describe a curve such that PQ is always tangent to it. * For a proof of this statement, see Instruments and Methods of Calculation, p. For the theory of this instrument, see F. W. Hill, Phil. Mag., xxxviii, 1894, p. 265.
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