Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 615
Fig. 3293 is a half-plan and elevation of a revolving light of four faces. In the diagram there arebut two lamps on each of the four sides of a square, though as many as ten lamps are often so placedin lights of the first class. It is obvious in this arrangement that the light from this apparatus…
Mechanical engineering
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