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 103
found in itselevation. Similarly, if the point be thought of as being on the circumference of a verticalcircle whose plan would be a straight line through p parallel to XY, a circle inelevation would need to be drawn in order to locate the elevation of the point.A tangent plane to the sphere at P… … Fig. 95. required, and the traces of the plane may now be drawn perpendicular to theradius from P. In Fig. 95 the same problem as in Fig. 94 is solved by the employment of avertical plane containing the radius from the given point and therefore at rightangles to the plane required. This vertical…
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-311-203.webp)
