Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 247
with its ends filed sharp. The upper end bears on a brass screw,whose lower end has been filed flat and slightly bored with adrill. The screw is inserted in the cross-piece attached to thebase-board. The lower end of the nail rests in a slight depressiondrilled in the head of a copper rivet. This… … circle whose diameter is about half that of the wheel, and whosecentre is the same, is struck off on the wood ; and four holes, alittle smaller than four wire nails, are bored through the wood atpoints on the circle 90° apart, and corresponding to the ends ofthe coils. The ends of the two adjacent…
Physics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
