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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 437

An illustration from 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, leaf 437
wn from e in A. Join Aeand A/. Then eAf is the angle between the given line and a perpen-dicular to the given plane. Find the complement of this angleby making Ag perpendicular to Af. Then gAe is the anglerequired. Peoblem 177. To determine the scale of slo-pe of a -planeperpendicular to a given… … HORIZONTAL PROJECTION 417 dicular to cD, till they meet the plane of reference in the pointse and /. Draw projectors from these points till they meetlines drawn from a and h, parallel to Z, in the points e and /.Join ef. This line is the H.T. of a plane perpendicular to Z.At any convenient point on…

Geometrical drawing

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