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 248
ich the machine is guided along the curve. The line through the dotsis parallel to PQ. The celluloid rests on the paper on which the originalcurve is drawn, thus supporting the outer end of the frame ABCD. Since the distance AV between the pin and the centre line of ST isconstant, and since KV/AY =… … Fig the movements of R, and therefore traces a curve of which the ordinates areproportional to the rate of change of the ordinate of the original curve. Itshould be noticed that the purpose of the second board is to eliminate the Yco-ordinate of the original curve. In using the machine the arm PO…
