The Averaged Freshman Graduation Rate for Public High Schools from the Common Core of Data: School Years 2002-03 and 2003-04

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...on to the bed after being run into position. The form of nut and handle shown at p, Fig. 46, is very convenient, as obviating the loss of time consequent on continually having to use a spanner for screwing up and unscrewing an ordinary hexagonal nut. The Tee-rest.--The Tec-rest, D, Fig. 46, consists of a socket r, which is movable along the bed and is gripped in the same manner as the poppet head, and a 'T' piece, or tool-rest, which can be raised or lowered, and turned in the socket at any angle, to suit the work which is being turned; it is then held in position by a set-screw at Also, by loosening the nut underneath, the socket can be moved to and fro across the bed, to suit the diameter of the work. Simple Power Lathe.--By displacing the treadle, crank, and driving pulley, and connecting the mandrel pulley by a belt with a driving pulley on shafting driven by power, the treadle lathe becomes a simple power lathe. In that case the mandrel pulley would require to have flat-rimmed steps to receive the belt, instead of the V-shaped rims as shown to receive the gut. TURNING Plain Cylindrical Turning.--For a general description of the operation of turning it will be sufficient if the turning of a plain solid cylinder be taken, as this is the most frequently recurring exercise in turned work. A piece of round metal, slightly longer and of slightly greater diameter than the finished cylinder, should be selected, and the operator should first test it with the straight-edge to see whether it is perfectly true longitudinally. Should it be only slightly out of truth, a few blows with the hand-hammer--the work resting on some flat surface, as an anvil--will straighten it; but if it be much out of truth, it should be struck while resting on two...