tly the second course of cuts is somewhat finer than the first.
The two series, or courses, fill the surface of the file with teeth, which are inclined towards the point of the file.
See Holtzapffel's Turning and Mechanical Manipulation, London, 1847.
A piece of soft steel, shaped and ground ready for cutting, to form a file.
A tool-holder like the stock of a frame-saw, and used to mount a file in a manner similar to that of the saw in the case cited.
he object with it.
A plate or pair of plates fastened upon the junction of a couple of meeting portions of a beam or plate.
The fish-joint for connecting railway-rails was first designed by W. B. Adams, England, 1847, and was soon extensively introduced.
It consisted of a pair of plates 18 inches long, 3 by 3/4 inches, bolted together through the rails by 4 bolts, allowance being made by oval bolt-holes for expansion and contraction of the rails.