Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 53
es, and F and F^ the points of tangency of two spheres. Let s be any point of the curve underconsideration and VL the element containiiag s. This element cuts the contact circles of the spheresin a and A. A plane through the cones axis and jiarallel to the paper would contain o t, o v andV n.… … * Schlomilcli, Geometrie des Maasses, 1874. CONIC SECTIONS AS HOMOLOGOUS FIGURES. 47 144. The proof that KsH (Fig. 91) is an elliiDse when the curve is referred to two foci is asfollows : KF= Km; KF, = Kt; therefore KF + KF, = Km + Kt= t m = x n = S KF + FF, =2HF+FF,; i. e., KF = HF,. Since s F= s…
Mechanical drawing · Lettering
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