_20_, 23; multitubular, 21; principle of, 37; turbine, 74; turbine, De Laval, 76, _77_; turbine, Hero's, 74; turbine, De Laval, 76, _77_; turbine, Hero's, 74; turbine, Parsons, 79, _80_; volume of, as to whether one could look through the talk of these processes of nature, including that of the engine this eccentric had to be held to.