. Appleton's dictionary of machines, mechanics, engine-work, and engineering. mities of the arc, and thesucking and forcing pipes communicate with the pump through it, as represented in the figure. Tothe centre of one or both ends of the case is screwed fast a thick piece of brass whose outline resem-bles that of the letter D; the flattened side is placed towards the butment, and is so formed that thesame distance is preserved between it and the opposite parts of the butment, as between its convexsurface and the rim of the case. The pistons, as in the last figure, are rectangular pieces of sto
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. mities of the arc, and thesucking and forcing pipes communicate with the pump through it, as represented in the figure. Tothe centre of one or both ends of the case is screwed fast a thick piece of brass whose outline resem-bles that of the letter D; the flattened side is placed towards the butment, and is so formed that thesame distance is preserved between it and the opposite parts of the butment, as between its convexsurface and the rim of the case. The pistons, as in the last figure, are rectangular pieces of stoutmetal, and are dropped into sUts made through the rim of the drum, their length being equal to thatof the case, and their width to the distance between its rim and the D piece. They are moved by acrank attached to the drum-axle. To lessen the friction and compensate for the wear of the butment,that part of the latter against which the drum turns is sometimes made hollow; a piece of brass is letinto it and pressed against the periphery of the drum by a spring. 3142.
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
