Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 105
ction are given. The previously discussed and more com-monly used method was explained in Part I, Section 9, and was shown to dependon the projections of a Hne set up at angles complementary to those of the requiredplane, the traces of the required plane being then drawn perpendicular to the… … Fig. 96. Suppose the required plane is to have angles of 60° to the H.P. and 45° tothe V.P., then a vertical cone to envelope the sphere, with its generators at 60*,to the H.P. and its apex therefore at V in the V.P., will have part of its circularH.T. represented by the arc de, and any plane,…
Geometry, Descriptive
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-359-250.webp)