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 152
BF fromB. Join FC. Then FCB will be the angle of 40° required. Note.—60° is always equal to the radius of the quadrantfrom which the scale of chords is constructed. XI INSTRUMENTS FOR MEASURING ANGLES, ETC. 131 Peoblem 166. To construct any angle luitliout a ])rotractor. Draw CD perpendicular to AB… … EH = 20°, HE = 10°, and FL = 5°. Therefore between D and Bwe can construct any angle that is a multiple of 5°. Divide the angle ACD into five equal parts by the linesM, ^^, 0, and P (Prob. 121). From A set off AE equal to DE.As AN = 36° and AE = 30°, AN - AE = 6°,ME = 12°, AM = 18°,and EO = 24°.…
Geometrical drawing
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