Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 310
1205. DRILL FOR CURVEDHOLES, used in coal mining. Thedrill is on the end of a curved tube, andis driven by a flexible shaft. The tubeis fed fonvard by a pivoted arm andworm gear. … 1206. BOX-WING BLOWER.—The dis-charge openings of the disc are rectangular,wdth the sides enclosed. Made of sheet metal.
Mechanical movements
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