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 322
PllOBLEM 82. To find the true angle hetween the H.T. and Y.T. of a given plane(e.g. the angle Vca in the -plane A. Fig. 107.) Fig. 109. Let ac and ee be the H.T. and Y.T. From any point a in the H.T. draw ad in the H.P. per-pendicular to it till it meets XY in d. From this point drawa perpendicular…
Geometrical drawing
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![An illustration from Brief synopsis of the course of lectures in descriptive geometry; as arranged for the first year Faculty of Applied Science and Engineering, University of Toronto. [By] J. Roy Cockburn (1922)](https://img.insideoutlibrary.com/img/200/ia-fybriefsynopsiso00cockuoft-19-14.webp)
