Nelltraljlame to Nibbler
beam, the top fibers are always in compression and the lower fibers always in tension. There must, therefore. be some point at which the fibers are neither in compression nor tension. The position of these neutral fibers is called the "neutral axis" of the section.
Neutral flame. A gas-welding flame wherein perfect combustion prevails.
Neutralization. (Chern.) Making neutral or inert, as by the addition of an alkali to acid solution. (Tel.) The provision of negative feedback in an amplifier to a degree sufficient to counteract or neutralize the effect of positive feedback.
Neutral position. (Auto.) That position of the gear-shift lever which places the change gears out of contact permitting the engine 'to run idle without giving motion to the car.
Neutral wire. (Elec.) The balance wire. The control conductor in a three-wirc distribution system. The wire carries the unbalanced current.
Neutrodyne. (Elec.) A radio circuit in which control of unwanted "feed back" is effccted by neutralizing condensers.
Neutron. (phys.) One of the three basic atomic particles, weighing about the same as the proton, but having no electric change.
Newel. (Arc/I.) A post at the top or bottom of a flight of stairs, supporting thc handrail.
News. (Papermkg.) A class of papers made chic fly from ground wood pulp and used for newspapers. New sand. (Fdry.) Sand that has not been used for molding.
Newsboard. (Paper) A cheap paper board made for the most part of waste newspaper.
News eases. (Print.) Type cases formerly used in newspaper work but now supplanted by the California, New York, and Yankee job cases.
Newsprint. (Print.) A plain woodpulp paper used for newspapers and where low-priced stock is required.
News stick. (Print.) A fixed-measure composing stick used to control column width. Used for newspaper work.
News-tone. (Print.) A halftone, 100 line or coarser, etched on zinc, usually for newspaper illustration.
Newton's Laws. of motion. (Phys.) 1st Law-Every body continues in a state of rest or in uniform motion in a straight line. except as it is compelled by a force to change its state of rest or motion. 2nd Law-If a body is acted upon by several forces, it is acted upon by each of these as if the others did not exist. 3rd Law-To every action there is always an equal reaction, i.e., if a force acts to change the state of motion of a body; the body offers a resistance equal and directly opposite to the force.
Nibbler. (Mach.) A metalworking machine capable of cutting odd shapes from plate and sheet metal by nibbling or biting off small particles.
Nichrome. (Metal.) A trade name given to an alloy of nickel and chromium. It welds readily and machines well with good high-speed cutting steel. Used for electric heater units and other resistance devices.
Nick. (Print.) A depression made in one side of the type to serve as a guide in setting type right side up.
Nick-bend test. (Engin.) The test specimen should be nicked on one side' and then broken. For class A plates there should be a wholly fibrous fracture, and for Class B plates not more than 10 per cent of the fracture should be crystalline.
Nickel. (Metal.) (Ni) A hard, white metal with specific gravity of 8.63. Its chief uses are for nickel plating and the forming of alloys.
Nickel aluminium. Eighty pf':r cent aluminium 'and 20 per cent nickel. Nickel increases the tensile strength of aluminium alloys, and improves the finish in die castings. .'
Nickel copper. (Metal.) A nickel and copper alloy used in making acidresistant castings and bearing bronzes. Navy specifications call for 60 per cent nickel, 33 per cent copper, 3.5 percent manganese, and up to 3.5 per cent iron.
Nickel molybdenum iron. (Metal.) A class of alloys containing from 20 to 40 per cent molybdenum and up to 60 per cent nickel with a small amount of carbon. Such alloys are much used on account of high acid resistance.immersions in a nickel salt bath through which an electric current of low voltage is passed.
Nickel silver. Also known as German silver. An alloy of copper, nickel and zinc.
Nickel steel. (Engin.) A steel containing about 3V2 per cent nickel. It is very strong and tough when properly heat tr~ated.
Nicke -tantalum alloy. (Chern.) A hard but ductile alloy containing 70 per cent nickel and 30 per cent of tantalum. Used for electrical resistance wires.
Niggling. (Art.) Work done with too much attention of detail; an overelaborate treatment.
Nippers. (Print.) The grippers on a cylinder press. (Wood Patrnkg.) A pincerlike tool with sharp jaws for cutting.
Nipple. (Pipe Fittings) A short length of pipe threaded at both ends.
Nipple chuck. (Mach.) A rapid adjusting machine chuck, used in production work for holding pipe while cutting and threading nipples.
Nitrate. (Chern.) (I) Salt of nitric acid, as silver nitrate. (2) Nitro derivative formed by treating or combining with nitric acid or a compound.
Nitric. (Chen!.) Obtained from or per taining to nitrogen.
Nitric acid. (Chen!.) (HNOJ) A colourless, highly corrosive liquid,
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