Nilriding to Nose wheel
Nilriding to Non-metaUu: sheat cable
usually made by decomposing sodium or potassium nitrate with sulphuric acid.
Nitriding. (Chem.) The process of adding nitrogen to alloys with iron base by heating the alloy in contact with ammonia gas or any other nitrogenous material.
Nitrogen. (Chern.) An odourless, colorless, gaseous element which forms four-fifths of the volume of air.
Nitro-glycerin. (Chern.) A light yellow or colourless oily liquid made from glycerin, sulphuric and nitric acid. Highly explosive. Mixed with clay to form dynamite.
Noble metal. (Chern.) A term applied to a precious or pure metal, and to metals that do not oxidize readily in the open air.
Nodes. (Elec.) The points of constant potential located bet~een loops of vibration in a circuit through which an oscillatory current is passing.
Nodule. A tape surface defect (see I agglomerate and asperities) which as either caused by foreign material in the coating or a non-homogenous portion of the coating material itself. The nodule is simple a lump, and will cause errors.
Nogging. (Masonry) The filling in of the space between studding with brick.
No-heet metal. Also known as "tempered lead." It is an anti friction metal composed of lead hardened with sodium.
Noil. (Textile) Short wool fibers I~ft in the combing and used for woolen yarns.
Nomenclature. (Engin.) A list of names or terms common to any particular art or science.
Non bearing partition. (Bldg.) One that sinlply divides the space into rooms and does not carry overhead partitions or floor joists.
Non-conductor. (Elec.) Any substance which does at allow electricity to pass through it.
Non-corrosive flux. (Sheet-Met. Wk.) A flux which does not cause a corrosion whefJ used in soldering or brazing.
Non-deforming steel. (Metal.) An oil hardening steel containing up to 1.5 per cent manganese used for tools and dies.
Non-ferrous metals. (Engin.) Metals not containing iron.
Non-inductive circuit. (Elec.) A circuit in which the magnetic effect of the current flowing has been re.duced by one of several methods to a minimum or to zero.
Non-inductive resistance. (Elec.) Resistance free from self-induction.
Non-inductive winding. (Elec.) A winding so arranged that the magnetic field set up by the current flowing in one half of the coil is neutralized by the magnetic field set up by the current flowing in the opposite direction in the second half.
Non-metallic shE:ath cable. (Elec.) A type of wiring material which has two or three conductors encased in a nonmetallic sheath or covering similar to "loom". Non-pareil to Nose wheel
Non-pareil. (Print.) A. size of type between minion and agate; 6 point.
Non-pressure (fusion) welding. A group of welding processes wherein the weld is made without pressure.
Non-rigid airship. (Aero.) One whose form is maintained only by internal pressure in the gas bags and balIonets.
Nordberg key. (Mach.) A round key for locking a hub to a shaft. It has a taper of 1/16 in. per foot, and the large diameter is about one fourth the diameter of the shaft up to 6 in. For larger sizes, the key is one fifth the shaft diameter.
Normal. In accordance with an established law or principle. (Math.) A line perpendicular to a curve.
Normalizing. (Engill.) The heating of steel above the upper critical temperature and then cooling in air.
Normal loop. (Aero.) A loop starting from normal flight and p~ssing successively through a climb, inverted flight; dive and back to normal flight.
Normal or three-point landing. (Aero.) A landing in which a path tangential to the landing surface and the loss in flying speed are attained at approximately the instant of contact.
Normal solution. (Chern.) A normal solution of an acid contains one gram of hydrogen ions per 1000 c.c. Examples: 36.5 grams of hydrogen chloride (HCL) per 1000 C.c.; 49 grams of suI ph uric acid (H2S04) per 1000 c.c., etc. This value is obtained by dividing the molecular weight by the number of hydrogen ions produced. A normal solution of a base contains. 17 grams of hydroxyl ions per 1000 C.c. Example: 40 grams of sodium hydroxide (NaOH) per 1000 c.c. Other normal solutions are prepared by using, per liter, the molecular weight of the chemical in grams, divided by a factor which varies with the use of the solution.
Normal spin. (Aero.) A spin which is continued by reason of the voluntary position of the control surfaces, recovery from which can be effected within two turns by neu tralizing or reversing all the controls. Sometimes calIed a "controlIed" spin.
Norman. (Arch.) That style of archi tecture which reached its height in England shortly after the Norman conquest.
Nose. (Shopwk.) The business end of tools or things. The threaded end of a lathe or milling-machine spindle, or the end of a hog-nose drill or similar tool.
Nose-down. (Aero.) To depress the nose of an airplane in flight.
Nose-heavy. (Aero.) The tendency of the nose to drop when in normal flight.
Nose-over. (Aero.) An expression referring to the accidental turning over of an airplane on its nose when landing.
Nose-up. (Aero.) To elevate the nose . of an airplane in flight.
Nose wheel. (Aero.) A wheel, usualIy steerable, set ahead of the
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