M to Machine tap ~
m. Symbol for electrmagnetic moment, mass, mass of electron, molality.
M. Symbol for magnetization per unit volume, luminous emittance, moment of force, mutual inductance.
Mach. A number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving
Machinable. Material capable of being finished by tools or cutters in or on a machine tool. .
Machine. (Meek) A device for transfonning or transferring energy.
Machine composition. (Print.) Any type composition done by mechanical method.
Machine drawing. (Draft.) A mechanical drawing of a machine or machine pa:1s provided with notes and dimensions for shop information.
Machine dried. (Papermkg.) Paper which is dried completely in the web and in contact with the cylinder driers of the machine.
Machine drilling. (Mach.) The drilling of work under a power-driven machine.
Machine finish. (Papermkg.) A finish intermediate between eggshell and En.Jili!h in smoothness which is produced on the paper machine.
Machine glazing. (Paper) A paper having a high finish on one side.
Machine language. System for letters, number.; and instructions that assigns actual storage locations and. requires no ttanslation by the computer for apertion.
Machine molding. (Fdry.) The use of special machines in the preparation of molds for the production of castings.
Machine rating. (Elec.) The amount of power a machine can deliver without overheating.
Machinery. A group of machines:' also, the working parts of an engine or machine.
Machinery steel. (Mach.) An openhearth steel with 0.15 per cent to 0.25 per cent carbon content. The term is rather general in its use and is frequently applied to any mild steel which cannot be tempered but may be casehardened.
Machine screw. A very commonly used type of screw with clt~ar-cut threads and ohr-variety of head shapes. It may be used either with or without a nut.
Machine tap. (Metalwk.) A tap for special use in machines. as distinguished from hand taps which are actuated by a tap wrench. Machine tool to Magnetic chuck
Machine tool. (Shopwk.) The name given to any machine of that class which, taken as a group, can reproduce themselves, such as the lathe, drilling machine, planer, milling machine, etc. No other class of machines, and because of this, machine tools are known as the "master tools of industry."
Machining. The operation performed by machines on metalwork. Machining allowance. (Mach.) Extra material on the rough part sufficient to permit bringing to finish size by tooling operations.
Machinist. One who operates machine tools. Mackie. (Print.) A spot, blemish, or blurred impression.
Macrocasm. The great world or universe; a representation of a smaller unit by a larger one, presumably of a similar structure.
Macrograph. A photograph or other representation of an object that is of the same size as or larger than the object.
Macroscopic. Visible to the naked eye Macromolecule. (Plast.) A molecule of such size that it exhibits colloidal properties.
Madrono. (Wood) A flowering tree native to the Pacific Coast. Wood is tough, heavy, and in colour light pink with spots of deep red; checks and warps badly. Madrono burl is similar to cherry and has considerable use in furniture manufature.
Magazine. (Arch.) A protected building or room for the storage of explosives or ammunition. (Prillt.) (I) A paper-bound periodical in book form, usually issued monthly. (2) A part of a composing machine in which matrices or letters are stored ready for assembling into lines.
Magic lantern. A device for projecting images mounted on slides or films.
Magic number. The atomic number or neutron number of an exceptionally stable nuclide.
Magnalium. (Metal.) An alloy of aluminium and from 2 to IO per cent magnesium. It is very strong and can be easily cast, forged, or machined..
Magnesia. (Chern.) A light, white powder derived by calcining magnesium carbonate, used as an antacid laxative.
Magnesium. (Metal.) A very light metal with specific gravity of 1.74. It is never used alone but alloyed with aluminium or other metals to produce light-weight airplane parts. etc. The metal ignites very easily and precautions must be taken against fire during machining operations. It is also used in flashlight powders, fireworks, and as a deoxidizer.
Magnet. (Elec.)A body or substance which has the property of attracting particles of iron to itself. Magnets are of the horseshoe or bar type.
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Magnet core. (Elec.) Usually a soft iron centre on which the turns of wire are wound to produce an electromagnet.
Magnetic cartride. A phono cartridge which derives its electrical output signal from changes effected in a magnetic circuit by means of some m~chanical device such as a moving coil, moving magnet.
Magnetic chuck. (Elec. Shopwk.) A chuck which holds iron and steel
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