Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . asynljitote and equidistant from CE; then either secant from A through the extremity of one ordinate willmeet the other ordinate in a point of the cissoid; P and Q, for example, will be points of thecurve. The tangent to the circle at B will be an asymptote to the curve. It is a somewhat interesting coincidence that the area between the cissoid and its asymptote isthe same as that between a cycloid and its base, viz., three times that of the cir
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . asynljitote and equidistant from CE; then either secant from A through the extremity of one ordinate willmeet the other ordinate in a point of the cissoid; P and Q, for example, will be points of thecurve. The tangent to the circle at B will be an asymptote to the curve. It is a somewhat interesting coincidence that the area between the cissoid and its asymptote isthe same as that between a cycloid and its base, viz., three times that of the circle from whichit is derived. * Leslie. Geometrical Analysis. 1821. THE GISSOID. — THE TRACTRIX. 69 200. Sir Isaac Newton devised the following method of obtaining a cissoid by continuous motion:Make AV=AC; then move a right-angled triangle, of base = V C, so that the vertex F travels alongthe hne DE while the edge JK always passes through V; then the middle point, L, of the base FJ,will trace a cissoid. This construction enables us readily to get the instantaneous centre and a tangentand normal; for Fn is normal to FC—the path of F, while n
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