es before the En- as no internal lubrication is necessary. gineers' Society of Western Pennsylvania, some Unquestionably the day of steam turbines has time ago, Mr. P. Hodgkinson mentions a test come; particularly of large sizes, not alone on ac- ;made in Prance, where a Laval turbine working count… … formed of projecting rings of blades tops of mountains or long elevated Fig. 2.—A COLUMN OF SHALE, SHOWING EBODED BASE.
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