Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 501
e, which, beyond the sphere, separatesthat portion of space which is in shadow from that which is illuminated. Inthe present case, on placing a screen, PQ, behind the opacjue body the limitof the shadow HG will be sharply defined. This is not, however, usuallythe case, for luminous bodies have… … both spheres, always cutting the line of the centre in the point A, it will pro-duce a conical surface with this point for a summit, and which traces behindthe sphere MN a perfectly dark space MGHN. If a second right line, LD,which cuts the line of centre in B, moves tangentially to the two…
Physics
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