Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 67
riven by a small electric motor (L),and gives in a compact, convenient form all that is requited for preparing metal specimensfor examination. The spindle (A) is madeof steel, and is bored outat the upper end to re-ceive the disc upon whichthe polishing or grindingmaterial is to be placed.The lower… … Fia. 67.—No. 1290.
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