draught hole RT GEO. M. HOPKINS. sirable. surrounded by a collar. The projection of opaque or solid objects by means To the bottom, g, are hinged the end, h, sides, ij, For the projection of fine objects, such as gems and of the optical lantern affords a way of showing upon their settings, a watch… … by Ives, Blakeslee & Williams ment; and third, to secure the Fig. l.-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, /, by the wood is useless to attempt projection on a…
Patents · Adapted · Munn · Scientific American · Device · Reduction company · Express money · Horse power · American supplement · Trade mark · American patent · Pittsburg reduction · Pure aluminum · Assistant secretary
Internet Archive · Public domain (published before 1931). Free to use for anything.
