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Scientific American, Vol. 90, No. 5 (1904) (1904)
leaf 10
frame and sub-frame of substan- Adjustable bearings are provided between each crank, rounded steel contact piece. A spiral slot in the sleeve and a pin on the cam shaft, projecting into this slot and are oiled by splash lubrication. tial construction. (seen at end of upper contact spring), makes it… … © 1904 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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