Obs. 7-—a sone of a sphere is that part which is inter-cepted between two parallel planes (a B D e A, f G H i f) ;and when these planes are equally distant from the centr-(c), it is called the middle zone of the sphere. … 11. A spheroid, or as it may be more pro-perly called, an ellipsoid, is a solid generatedby the revolution of a semi-ellipse about one THE DECORATOR S ASSISTANT. 13 of its diameters, which remains fixed, A B c D. t>
Design · Decoration and ornament · Art
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