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 403
o H.T. At i draw aperpendicular till it meets a horizontal line from C in i!. Draw A^.T. through i! till it meets the H.T. on XY. 382 SOLID GEOMETRY Peoblem 150. To determine the traces of a T.P. to a given sphere ; the 2Jointof contact to he in the lower part of the sphere. Fig. 180. Let A and A… … Fig. 180. Draw a line perpendicular to clc till it meets XY in /, and ahorizontal line from g in e. By repeating this construction onthe opposite side of A we obtain the elevation of the frustrum ofan inverted cone tangential to the sphere, da being the elevationof the circle of contact between…
Geometrical drawing
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