Precision lathe to Pressure airship
lerances are exceedingly close.
Precision lathe. (Mach.) A small bench lathe used for very accurate work.
Prefabricated. (Arch.) Something completely or in part built in a factory' or elsewhere to be finally erected at the place where it is to be used.
Preform. (Plast.) In plastic lamination, to save time and labour, rather than drape t~e mold with glass cloth, difficult mold forms are filled with a fibrous glass liner, preformed by various methods, but chiefly by blowing cut fibre, together with a binder, over a screen form a binder, over a screen form which approximates the contour of the mold. When dried, it is inserted into the mold, charged with resin, and pressed into the finished product.
Preforming. (Plast.) The process of condensing molding compounds to insure easier and quicker filling of the molds with a minimum amount of waste.
Preignition. (Auto.) A condition 'of detonation brought about by either hot carbon deposits, .or faulty ignition, in which gas is exploded prematurely. Preliminary. Introductory; preceding the main discourse, business, or subject; something done at the outset.
Premix. (Plast.) In plastic molding,the plastic is mixed with fillers pigment and glass fiber, and forced into a die under pressure and heat. The term refers to mold ingredients mixed in the plant, rather than to those ready-mixed outside the plant.
Presentation. The act of offering for acceptance, approval, etc.; introducting or bringing forward.
Pressboard. (Print.) Hard, smooth cardboard used where a solid packing is needed in the tympan of the platen press.
Pressed brick. (Masonry) A highgrade brick used for exposed surface work.
Pressed steel. (Metalwk.) The great variety of articles shaped or pressed from steel sheets or plates by dies or forms.
Press fit. (Mach.) A fitting together of parts by pressure; slightly tighter than a sliding fit.
Press polish. (Plast.) A finish for sheet stock produced by contact, under heat and pressure, with a very smooth metal which gives the plastic a high sheen.
Press revise. (Print.) A final proof; one taken after all revisions and corrections have been made.
Pressroom. (Print.) The room where printing is done.
Pressure. (Elee.) Electromotive force (e.m.f.) commonly spoken of as voltage. (Phys.) Force per unit area.
Pressure airship. (Aero.) An airship that maintains its form either wholly or in part by internal pressure. Non rigid, semi rigid, and pressure rigid are pressure airships.
pressure altitude to primary colors
Pressure altitude. (Aero.) (I)"lbe altitude corresponding to a given pressure in a standard atmosphere. Pressure circulating system of lUbrication. (Atuo. Mech.) A pump is so located that it can lift oil from a reservoir in the lower part of a machine or engine and deliver it under pressure through pipes or drilled holes to the parts to be lubricated. Commonly used on automobile engines.
Pressure nozzle. (Aero.) An instrument which, in combination with a gauge, is used to measure the indicated speed of an aircraft relative to the air. It may be a pitot -static or a venturi tube, or a combination of a pitot tube and a venturi tube.
Pressure pads. (Plast.) Reinforcements of hardened steel distributed around the dead areas in the faces of a mold to help the land absorb the final pressure of closing without collapsing.
Pressure reducing. (Steam Heat.) Device for reducing steam pressure in heating systems where boilers are operated, for power purposes, at high pressure.
Pressure-rigid airship. (Aero.) An airship combining the principles used in both rigid and nonrigid airships to maintain shape and skin tautness.
Pressure system for fuel supply. (Auto.) Jfhe system used before the invention of the vacuum tank,for supplying gas when the tank was lower than the carburetor. A small hand pump is used to pro pump thus maintaining pressure. In this system the gas tank must not be vented.
Pressure welding. A group of welding pr.ocesses wherein the weld is consumated by pressure:
Prickpunch. (Mach.) A small center punch. Also known as a layout punch.
Primary. (Auto. Elec.) Refers to the low-tension (6 volts) circuit.
Primary ceO. (Elec.) A device for transforming chemical energy into electrical energy. It consists essentially of a jar containing the solution, or electrolyte, and two plates or electrodes.
Primary coil. (Elec.) The coil into which the original energy is introduced and which sets up magnetic lines of force to link with another coil in which energy is induced.
Primary colors. The fundamental hues of the pigments red, yellow
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