Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Ploto- Truck. PloW-vyheeL A wheel on the head end of a plowto limit the penetration of its share. In the illus- Fig. Bom-Wheel. tration (an English pattern), one wheel runs on theland and the larger one in the furrow. Pluck. A two-pronged dung-drag. Plucker. (Worsted ) A machinefor straightening and cleaning long wool, to renderit fit for com
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Ploto- Truck. PloW-vyheeL A wheel on the head end of a plowto limit the penetration of its share. In the illus- Fig. Bom-Wheel. tration (an English pattern), one wheel runs on theland and the larger one in the furrow. Pluck. A two-pronged dung-drag. Plucker. (Worsted ) A machinefor straightening and cleaning long wool, to renderit fit for comhing. It has a traveling feed-apronwhich, as it advances, delivers the ends of the longtufts to a pair of spiked rollers, which open the tuftsand locks ; it is thence introduced into a fanningapparatus whereby the wool is cleaned. Plug. 1. (BuHdiufi.) A block of wood let intoa wall of brick or masonry, to afford a hold for nailsIn fixing the interior finishing. PLUG-CENTER BIT. 1749 PLUGGER. 2. (yautical.) a. A conical piece of wood usedto stop the hawse-holes when the cables are unbent. b. A block to stop a hole made by a cannon-ballin a ship. c. A stopper for the hole in a boat-bottom. 3. {Steam-boiler.) A stopper of metal which isplaced in a steam-boiler or a pipe in connnunieationtherewith, and which melts at a certain temperature,so as to estab
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