. Machinery and processes of the industrial arts, and apparatus of the exact sciences. hich this isaccomplished is a second and small hydraulic press on the top of themovable cylinder of the larger one, to which it is firmly secured. Thissmall press has a plunger which passes through a packing box intothe large cylinder, and rests on the piston in that cylinder. When thepress is at its lowest point, it is evident that both the piston of the large-cylinder and the plunger of the small one will occupy the most advancedpositions possible in their respective cylinders. Let now water be driveninto
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. hich this isaccomplished is a second and small hydraulic press on the top of themovable cylinder of the larger one, to which it is firmly secured. Thissmall press has a plunger which passes through a packing box intothe large cylinder, and rests on the piston in that cylinder. When thepress is at its lowest point, it is evident that both the piston of the large-cylinder and the plunger of the small one will occupy the most advancedpositions possible in their respective cylinders. Let now water be driveninto the small cylinder by the force pump, and it will by degrees expelthe plunger, which, resting on the large piston as its support, will liftthe whole connected mass, including both cylinders and the upper tableof the press. The length of the plunger being equal to that of thegreat piston, the press is thus easily lifted to the highest point. It fol-lows, of course, that the little cylinder, having no work to do but toraise the press, is of trivial dimensions compared with the 198 PARIS UNIVERSAL EXPOSITION. One additional remark is necessary. Inasmuch, as the piston rod occu-pies some space in the cylinder below the piston, it does not require somuch water to fill the cylinder on this—that is the lower—side of thepiston, as is required above; and moreover, the small cylinder requires asupply, which is discharged when the press descends. At the base ofthe large cylinder, and surrounding it therefore, is attached an annularbasin, which serves to receive the surplus water during the descent ofthe piston, and to supply the deficiency when it rises. While, therefore,the main cylinder is chiefly its own reservoir, this small additional pro-vision has to be made, but it is too trivial to occasion inconvenience. DESGOFFE & OLLIVIERS STERHYDRAUXIC APPARATUS. The most ingenious and most decidedly original forms of hydraulicpresses and hydraulic pressure apparatus which present
Size: 1429px × 1748px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
