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 562
Fig. 321. draw a line parallel to ED till it meets CD produced in H,Then HB is the unit required. Problem 269, To determine the square roots of 2, 3, 4, 5, etc.Unit = 1. Eig. 322. Draw AB and BC, each 1 inch in length, perpendicular toeach other. Join AC. GRAPHIC ARITHMETIC 541 Then by Euc. I. 47,… … O F H Fig. 322. AB produced in D. Draw DE, one unit in length, perpendicularto AD. Join AE. Then AE = ^3- Proceed in the same manner to find the square roots of4, 5, etc. Problem 270. To determine — by constntction. Fig. 323.Let vi — 7 and 71 = 9.
Geometrical drawing
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