. Machinery and processes of the industrial arts, and apparatus of the exact sciences. Coignard & Pump—section. of aspiration is L, which communicates with the space between thedrums O I. The form given to the pallets in this machine is spiral; theyare only two in number in each drum. As in the other pumps, theform of the helices is professedly such as to make the section of passageinversely proportional to the velocity of the water at different distancesfrom the centre. The obvious advantages of Mr. Coignards construction are, the pre-vention of the loss of living force in the column of
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. Coignard & Pump—section. of aspiration is L, which communicates with the space between thedrums O I. The form given to the pallets in this machine is spiral; theyare only two in number in each drum. As in the other pumps, theform of the helices is professedly such as to make the section of passageinversely proportional to the velocity of the water at different distancesfrom the centre. The obvious advantages of Mr. Coignards construction are, the pre-vention of the loss of living force in the column of aspiration whichoccurs in other pumps by the encounter of two currents entering from 186 PARIS UNIVERSAL EXPOSITION. opposite sides, and the freedom from liability to receive air mingled withwater in aspiration, since such air rises to the middle of the space be-tween the drums, above the openings F F, where provision is made forits escape. It has, moreover, stuffing-boxes only on one side. The termftelicoidal, applied to this pump by the inventor, describes the form ofthe pa
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
