. Machinery and processes of the industrial arts, and apparatus of the exact sciences. cal pump, and furnishes a figure of it, which essentially resembles the engine of Messrs. Pill-ner and Hill, and concludes with the remark: This arrangement, early known, has beenproduced in our days as new. (See the collection of Grollier de Serviere, Lyons, 1719.)The correspondent of the London Engineering, at the Exposition, also remarks of it,There is nothing new in this contrivance which is a reproduction of Murdochs rotatoryengine of the last century, and it in its turn is a copy of the Machina Pupperh
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. cal pump, and furnishes a figure of it, which essentially resembles the engine of Messrs. Pill-ner and Hill, and concludes with the remark: This arrangement, early known, has beenproduced in our days as new. (See the collection of Grollier de Serviere, Lyons, 1719.)The correspondent of the London Engineering, at the Exposition, also remarks of it,There is nothing new in this contrivance which is a reproduction of Murdochs rotatoryengine of the last century, and it in its turn is a copy of the Machina Pupperheimana, fig-ured as a pump in Leupolds Theatrum Machinarum, published in 1727. Thus it appearsthat neither the American nor the British invention can claim the merit of originality. 88 PAEIS UNIVERSAL EXPOSITION. length of the cylinder in the direction of the axis. Each pair ofpistons is thus attached to its own cone only for half the pistonlength, while the other half projects over the core belonging to theother pair. Neither pair of pistons can therefore pass the other. Fig-. ^ ™ though they may come into contact. Each pair of pistons has itsindependent shaft, and externally to the cylinder each of these shaftscarries an elliptical gear-wheel, which works into an equal and similarwheel upon a shaft parallel to the piston shaft. This second shaft, which Fig. 17.
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