American journal of pharmacy . CHEMICAL AND PHARMACEUTICAL MANIPULATION: 19 A much more convenient implement than the preceding is the lever press,described in Muspratts Chemistry, and a perspective view of which isshown by Fig. 375. It consists of two wrought-iron pillars b b, supportedin sockets by the cast-iron feet a a. The bed-piece c is also secured to thefeet by two perforated ears, and has two intersecting grooves sunk into itssurface, as channels for conducting off the expressed liquid. The followerD, corresponding in size with the bed-piece c, is adjusted to the pillars bysliding-ear
American journal of pharmacy . CHEMICAL AND PHARMACEUTICAL MANIPULATION: 19 A much more convenient implement than the preceding is the lever press,described in Muspratts Chemistry, and a perspective view of which isshown by Fig. 375. It consists of two wrought-iron pillars b b, supportedin sockets by the cast-iron feet a a. The bed-piece c is also secured to thefeet by two perforated ears, and has two intersecting grooves sunk into itssurface, as channels for conducting off the expressed liquid. The followerD, corresponding in size with the bed-piece c, is adjusted to the pillars bysliding-ears, and has the rack-bar f fixed in the centre. The gearing issustained by framework e attached to b b. Motion is effected as follows:—The ratchet-wheel g turns upon an axle having its bearings in the topframe. On the same centre is a fixed pinion of eight teeth, only partially Fiff. the figure, which works in the wheel i, of twenty-four cogs; andupon the axis of i is another eight-teeth pinion, which actsupon the rack. The lever k is forked at the extremitynearest the small winch-handle l, and the terminations ofof the furcation are received upon the axle g. A pin, nearH, is adapted to a small hole in the frame, by the insertionof which the descent of the lever may be prevented. Thematter to be pressed is placed in a shallow, cylindricalbox A, of tinned copper, Fig. 376, which rests upon thebed c of the press. To prevent the contents from beingpressed against the sides of the cylinder, and thus abstruct-ing the flow of the liquid thence, it is necessary to use aperforated band with perpendicular ribs on the movable and formed of two parts joined together by
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Keywords: ., bookcentury1800, bookidamericanjournal29phi, booksubjectpharmacy
