very large number of sections of girders, beams, and-oth- er objects of iron, and the engravings will doubtless be found of utility for refere.ice, in determining the selection of any especial shape desir2d for a particular purpose. Of CHUCKS, several improved forms are represented in Figs. 1 and… … Exrpypansion Chuck. carries uv oil to lubricate the latter. F has a transparent reservoir vith metallic socket, a, screwing into the seat, ), threaded mandrel of the lathe head. The object to be turned fitted to the cap of the journal box. Between this and the is thrust into the chuck, expanding…
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