. Machinery and processes of the industrial arts, and apparatus of the exact sciences. teen inches andthat of the core eight inches, the distance of the centres of rotationbeing eleven inches, we shall find by computation that fully fifteen percent, of the steam admitted is productive of no effect. This is a disadvan-tage, but the other merits of the engine are such that it is probablydestined to come into extensive use. PILLNER & HILLS ROTARY ENGINE. Another rotary engine was exhibited by Messrs. Pillner & Hill, ofNewport, England, which in external appearance presents some resem-blance to th
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. teen inches andthat of the core eight inches, the distance of the centres of rotationbeing eleven inches, we shall find by computation that fully fifteen percent, of the steam admitted is productive of no effect. This is a disadvan-tage, but the other merits of the engine are such that it is probablydestined to come into extensive use. PILLNER & HILLS ROTARY ENGINE. Another rotary engine was exhibited by Messrs. Pillner & Hill, ofNewport, England, which in external appearance presents some resem-blance to the one just described. Like that it has two cylindrical cham-bers in the same casting, and two systems of rotary pistons. Therotating parts, however, which are shown in Fig. 14, herewith given,essentially differ from those of the Behrens engine, being in the form oftwo deeply indented gear wheels working into each other. These wheelsby the close contact of their cogs prevent the passage of steam betweenthem, and they are adapted steam-tight to the interior of their cylinders. 86 PARIS UNIVERSAL EXPOSITION. by metallic packing in the tips of their teeth. Practically it is found to besufficient to pack two teeth diametrically opposite to each other in each Fig;. 14.
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