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 107
the tangent points on their surfaces. The spheres havetheir centres all at the same level, and these centres are the corners of an equilateral triangle2 side, with no side parallel to the V.P. Diameters of the spheres if, i\ and f respectively 2. Three spheres rest on the H.P. and touch each other.… … Fig. 97. When the centres of three unequal spheres are at unequal distances fromthe planes of projection and the spheres are not all resting on the H.P., then theline joining the apex points of the enveloping cones will be oblique, and the problembecomes more involved. If, however, the line joining…
Geometry, Descriptive
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