pumelo

See pomelo. pumeyt, n. Same as pumice . Thetis in her bower Of pumey and tralucent pebble-stones Receives the weary bridegroom of the sea. Peele, England's Holidays. pumicate (pūʻmi-kāt), v. t.; pret. and pp. pumi cated, ppr. pumicating. [ smooth with pumice. [Rare.] pumice (pum'is or pū'mis), n. [Early mod. E. also pumish, also pumey, pumie ( -stone ); E. pounce2 ) = Sp. pómez = Pg. pomes = It. pomice = AS. pumic ( stān ) = D. puim ( steen ) = OHG. bumez, MHG. bumez, bimz, G. bims, bims ( stein ) = Sw. pim ( sten ) = Dan. pimp ( sten ), pumice, IMG:content-1297.png:[blocks in formation] G. pumpe also in another form, G. plumpe, a pump; cf. G. plumpen = E. dial. plump, v., pump, forms simulating plump2, or more prob. original, and connected with plump2, and thus ult., like plunge, liquids from a lower to a higher level through a pipe or pa age by means of one or more pistons or plungers (with or without valves), or analogues of these devices, working in, or in correlation with, one or more pump barrels, pump-stocks, chambers, or confined spaces. Of this cla the common single-acting house-pump, the details of which are shown in the cut, is a familiar example. (b) A hydraulic machine for forcing liquids under pre ure through one or more pipes or pa ages, in any direction, by means of one or more pistons or plungers, or analogues of these devices, working in one or more cylinders, trunks, pump-barrels, pump stocks, chambers, or confined spaces. See force - pump. (c) A pneumatic machine for forcing aëriform fluids or vapors in any direction through a IMG:content-1298.png:[blocks in formation] Single-acting Cast-iron House-pump. a , lever; b , plunger or piston; c , fulcrum; e, lower valve, or foot valve;, base, support. ing all other parts. pump piston. In the chain - pump, the "buttons" on the chain are substantially pistons of a lifting-pump. In the spiral pump, which forces water through a spiral pa age, as the Arch i me dean screw, the portions of the walls of the pa age lying behind the liquid are the analogues of pistons. In rotary pumps, acting by direct pre ure or by centrifugal force, or having a turbinate form, the analogues of pistons are the rotating vanes, buckets, etc. In propeller pumps, the blades of the propeller-wheel represent the pistons. In pumps of the monte - jus variety, including steam vacuum-pumps, the pulsometer, etc., the representation of the piston is a volume of steam which first pre es upon the liquid, and is then condensed and replaced by an equal volume of liquid, which in its turn is displaced by another volume of steam. In jet - pumps, the analogue of the piston is either a liquid column moving at high velo city to force other portions of liquid or vapor forward, or a column of air, gas, or vapor, which, in the steam injector and ejector, is steam that is condensed to a liquid during its movement without much reduction in its velocity.] 2. [ I was the easier indeed because, for all her pumps , she gave no hints of the key and the door, ., which, had he Richardson, Pamela, 4844 Cf. E. dial. plump = G. plumpen, pump.] I. in trans. To work a pump; raise water or other liquid with a pump. Not so, oh Charon, wanting to defray, Thou hast my paines, I pumpt part of the way, Then tug'd at th' oare, being that only soule Who in thy barge did neither mourne nor houle. Heywood, Dialogues (Works, ed. Pearson, 1874, VI. 233). while they pour out their vows to their saviour gods, at the same time fall lustily to their tackle, and pump without intermi ion. Mariners,. War burton, Divine Legation, iii. 6. Pumping of the barometer, the oscillation of the mercury in the tube of a barometer, resulting from sudden movements of the instrument, or sometimes from the mechanical influence of blasts of air in compre ing or rarefying the air when the barometer is placed near an obstruction. At sea, where the barometer is subject to the pitch the partners, to prevent water from running down its sides.