s arrangement if de- cover, with the exception of the central draught hole BY GEO. M. HOPKINS, sirable. The projection of opaque or solid objects by means surrounded by a collar. To the bottom, g, are hinged the end, h, sides, 77, For the projection of fine objects, such as gems and of the optical… … by Ives, Blakeslee & Williams ment; and third, to secure the Fig. 1.—THE MEGASCOPE. Company, of this city. best effects, suitable shadows are The lamp flame is in one focus as necessary as strong lights. It opening in the center of the cover, f, by the wood is useless toattempt projection on a…
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