Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 289
frequently. Let the true length of any side of the above cube be S. Then the truelength of a diagonal is S\/2. Now remembering that the angle ooc = 120°,oab = 60°, etc., prove that the projected length of any side of the cube isequal to 0.81647S. The ratio, .816 + , is called the isometric scale,… … XIII, § 2221 OTHER METHODS OF PROJECTION 271 222. Typical Case. Figure 251 shows the elevation andsection of a flat arch in a battered wall. Let it be required toshow the keystone in isometric projection. For the sake ofclearness, the scale of the detail is enlarged. First draw aroundthe given…
Geometry, Descriptive
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