Smithsonian Institution · Washington : Smithsonian Institution · leaf 162
ed from the original, however, in demanding a changeable stroke, and in the absence of the lateral motion. In another most essential feature it varied from both that and Mr. Lassell’s, the mirror was always uppermost while polishing, and being uncounterpoised escaped to as great an extent as… … Polishing Machine. The construction is as follows: A stout vertical shaft, a, Fig. 21, carries at its top a circular table 6, upon which the polisher ¢ is screwed. Below a band-wheel d is fixed. Above the table, at a distance of four inches, a horizontal bar e is arranged, so as to move back and…
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