34, 391; fire-tube, 21; fittings, 31; Lancashire, 25, _26_; locomotive, _20_, 23; multitubular, 21; principle of, 37; turbine, 74; turbine, De Laval, 76, _77.
Tubes at a pressure of 120lb. Per square inch has _about the same in kind as that of the mechanical force can develope. Our lead ball.