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 310
ll be the inclination of theline to the H.P. AB is the true length of the line, and is equalto AB. The Grreek letter 0 (theta) is generally used to express theinclination a line makes with the H.P., and the angle with theV.P. by <f> (phi). We shall be able to remember this better ifwe notice… … Fig. 93. represent a 60° set-square. If we revolve it on the line OB asan axis, the hypotenuse AB will describe a semi-cone againstthe V.P., and the lines AB, CB, DB, etc., will all form a constantangle with the H.P., viz. 60°, although the angle they form withthe Y.P. will vary with each position.…
Geometrical drawing
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