Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 442
h a as centre,and radius ad, draw a circle. This is the H.T. of a coneenveloping the sphere a. Draw a tangent to this circle andthe base of the cone, passing between them, as hg. This is theH.T. of the T.P. required. Produce hg, and draw a line from t parallel to it. Draw Zperpendicular to these… … Fig. 223 422 SOLID GEOMETRY contact between the sphere and the enveloping cone. Drawthe projector ee. With a as centre, and radius ae, draw anarc. Draw a line from a, perpendicular to hg, till it meets thisarc in i. This is the point of contact. To determine the index of i, find its elevation, as…
Geometrical drawing
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