r day, one after another, the on it under great pressure. The blank revolving be- chester, and described in a recent number of the Hngi- wear and tear must be great. neer. Several years have been occupied in perfecting tween the rollers receives from the grooves the im- The size adopted for the… … The first machine made by Messrs. Fairbairn & CIRQUMEERENCE est diameter of the screw at the bottom of thread. Wells had two plates grooved and sliding in opposite Thus, for 5g in. coach screw, the largest possible size hot. Screws below 14 in. in diameter are made with directions, the blank being…
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