plate finish to Plug
Plate finish. (Papermkg.) A term applied descriptively to English finish or lightly supercalendered papers because of the similarity to a plated finish.
Plate glass. (Bldg.) A high-grade glass cast in the fonn of a plate or sheet and subsequently polished; usually thicker than window glass, of smoother surface, and better quality.
Platen. (Mach.) A flat working surface for laying out or assembling metal work, or the movable table of a planer or similar machine. (Print.) That part of a job press on which the sheet takes the impression from the type.
Platen press. (Print.) One in which both paper and fonn lie flat during the process of printing.
Plate rail. (Arch.) A narrow shelflike molding attached to an interior wall for the support.of dishes, etc.
Plate voltage. (Radio) The D.C. voltage impressed between the ground and plate of any vacuum tube by the power supply.
Platform. (Bldg.) A horizontal struc ture usually covered with wood or metal and set on uprights to form an elevated flooring or stand.
Platform framing. (Bldg.) In this type of construction the floor platf.1rms are framed independently; the second and third floors are supported by studs one story in height.
Plating. (Metal.) The depositing of a metallic coating on another material or metal either by dipping or by the electrolytic process.
Platinite. (Metal.) A 46 per cent nickel steel which has the same thennal coefficient of expansion as platinum for which it is substituted, especially in the manufacture of electric lamp bulbs.
Platinoid. (Metal.) An alloy of German silver and tungsten used in the manufacture of electrical appliances, particularly resistance coils.
Platinum. (Metal.) A very heavy, rare, white metal, specific gravity 21.5 It is very ductile, and does not oxidize readily. It is used in the manufacture of jewelry, for scientific apparatus, and in certain industrial processes.
Play. (Mach.) The motion between poorly fitted or worn parts.
Pliant. Flexible; easily bent without breaking.
Pliers. (Mecn.) A pincerlike tool having broad, flat, roughened jaws.
Plinth. (Arch.) The lowest square shaped part of the base of a column or pedestal.
Plotting points. (Math.) The determining of the position of, and the locating of points as in a graph.
Plow. (Carp.) (I) A grooving tool.(2) To cut a groove.
Plowing. (Aero.) Taxting a seaplane at low speed before rising on the step.,
Plow-share. (Agric.) The furrow-cut ting part of a moldboard plow.
Plug. (Eke.) A device with conducting projections which fit into slots, making electrical contact between Plug fuse to pneolator an appliance and a source of supply.
Plug fuse. (Elec.) A type of fuse which is held in position by a screw-thread contact instead of spring clips as is the case with a cartridge fuse.
Plug gauge. (Mach.) A precision plug for testing the size of holes or internal diameters in machine work.
Plug tap. (Mach.) The intermediate tap in a series of three: (1) starting tap, (2) plug tap, (3) bottoming tap. SEE TAPS.
Plug weld. (Weld.) A method of attaching plates of fixtures by welding through a hole in one or both of the parts.
Plumb. (Bldg.) To rest or true up vertically, as a wall by means of a plumb line.
Plumbago. Graphic or black lead, used for pencils. crucibles. and for lubricating purposes; also for coating nonconducting surfaces, as gutta- percha.
Plumb and level. (Bldg.) A piece of well-finished hardwood or metal with bubble set lengthwise for testing horizontal accuracy and another bubble set crosswise for I testing vertical accuracy.
Plumb bob. (Masonry) The" weight used at the end of a plumb line.
Plumbing. Installation and repair of water pipes, tanks, bathroom fixtures, sewage lines, etc.
Plumb line. A cord with a metal bob attached to one end, used to determine perpendicularity, the depth of water etc.
Plunger. A piston like reciprocating part moving within the cylinder of a pump or hydraulic device. Plummet.A piece of lead attached to a line for adjusting to the vertical; also for sounding depths.
Pluger-type oil pump. (Auto.) Similar in operation to any cylinder and plunger pump. On one plunger stroke oil is drawn into the cylinder and a check valve closes after it. On the return stroke the piston forces the oil out of the cylinder into the oil lines of the engine past another check valve.
Ply. (Paper) A layer or thickness, as in something built up of several layers, each thickness being termed a ply.
Plywood. (Woodwk.) Veneered sheets glued togehter, the wood grain alternating in each sheet.
Pneolator. (Mach.) A portable apparatus for adminsitering automatic artifical respiration.
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