Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 68
PI V … SHADES AND SHADOWS. 33 To find the points of shadow, which fall on the circumference ofthe lower base of the cone. These points are found by the specialmethod of (42). The ray VJ—VJ7, through the centre of theupper base, pierces the horizontal plane (the plane of the lowerbase) at J. Then a circle…
Shades and shadows
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