Maximumn to Mercury

Maximumn to Mechanical engilleering

Used very successfully for boiler tubes, furnace parts, etc.

Maximum. (Math.) (I) The greatest quantity, degree, or amount. (2) The highest possible of all the values which a variable or a function can express.

Maximum range. (Aero.) The maxi­mum distance a given aircraft can cover under given conditions, by flying at the economical speed and altitude at all stages of the flight.

Maximum revolutions. (Aero.) The number of revolutions per minute corresponding to the maximum horsepower.

Maximum voltage. (Elec.) The high­est voltage reached in each alterna­tion of an alternating e.m.f.

Mean. (Algebra) Having an interme­diate value between two or more values; an average.

Mean chord of a wing. (Aero.) The quotient obtained by dividing the wing area by the span.

Mean line. (of an airfoil profile) (Aero.) An intermediate line bet­ween the upper and lower contours of the profile.
Measure. (Print.) The width of a col­umn, type page, or the width of a job. Measurement. Size; area; capacity. The act of measuring.

Measures. See apothecaries' fluid measure; avoirdupois weight; cir­cular; cubic, dry; linear; liquid; metric system; square; surveyor's area; time, and troy.

Measuring machine. (Shopwk.) A large bench micrometer caliper of any desired form of measure taps, reamers, gauges, etc. Some are now made to utilize light waves instead of mechanical methods.

Measuring tape. A graduated tape, steel or linen, usually in 50- or 100- foot lengths, used by engi­neers, builders, surveyors, etc.

Mechanic. A skilled workman who makes, repairs, and assembles ma­chinery or mechanical parts.

Mechanical brakes. (Auto.) Any brake system where pressure on the brake pedal is transmitted to the brake shoes on each wheel by a combination of rods, levers, cams, or cranks.

Mechaical. drawing. Drawing accomplished with the use of in­struments. Technically, the term includes orthographic projection, architectural and engineering drawing; various kinds of persp­ectives, and projections.

Mechanical efficiency. (Mech.) The mechanical efficiency of an engine is the ratio of its brake horse power and its indicated horsepower.

Mechanical engineer. One who is expert in the design, construction, and use of machinery or mechani­cal devices. ,

Mechanical engineering. That sci­ence which relates to the design­ing and cqnstructing of apparatus Mechanical lapping to Mercury arc rectifier in which power is generated and transmitted.

Mechanical lapping. (SEE LAPPING.)

Mechanically. According to the rules of mechanics. Automatically; by rule; without though or purpose.

Mechanical vibrator. (Elec.) A make­and-break device operating me­chanically.

Mechanic arts. Term usually applied to school-shop training in crafts­manship and the use of tools and machinery. .

Mechanics. That branch of science which treats of the effect of force upon matter.

Medallion. (Arch.) (l) A circular or oval unit of decoration usually sur­rounded by a frame. (2) A large medal.

Median. The middle; an average.
Medium carbon steel. (Metal.) Has carbon content between 0.30 and 0.70 per cent. Medium fit. (class 3) (Mech.) Used for sliding and running fits on ma­chinery where greater accuracy is necessry than would obtain with "free fit." Medium force fit. (class 7) (Mach.) Such fits are effected through con­siderable pressure.

Medullary rays. (Wood) Those fibers or rays which can be seen radiating from the center in a cross-section of an exogenous tree. Boards sawed radially from the tree, exposing these rays, have the better grain effects.

Meeting rail. (Arch.) The horizontal wood or metal bar which divides the upper and lower sash of a window.

Meg or mega. (Elec.) When pre­fixed to a unit of measurement it means one million times that unit.
Mega-volt. (Elec.) A unit of e.m.f. equal to one million volts.
Megohm. A unit of electrical resis­tance equal to one million ohms.

Melting point. (Metal.) The tempera­ture at which a substance changes from a solid to a liquid condition.

Melting zone. (Fdry.) That portion of the cupola above the tuyeres where the metal melts.

Mensuration. (Math.) That branch of mathematics which has to do with the finding of the length of lines, areas of surfaces, and vol­umes of solids, etc.

Mer. (Plast.) The structural unit in a polymer. (See Polymer.)

Mercerize. (Chern.) To treat cotton fiber or fabrics with a solution of caustic alkali which causes the fiber to shrink in length and become stronger and more receptive of dyes. The material assumes a silky luster.

Merchant bar. (Metal.) Muck bar is cut into short lengths, piled, re­heated, and rerolled into refined bar iron or "merchant bars."

Mercury. (Chern.) A silver-white liq­uid metal with specific gravity of 13.6, obtained principally from cin­nabar of mercuric sulphide (HgS), which occurs in brilliant red crys­tals. Of great use in the forming of amalgams.
Mercury arc rectifier. (Elec.) A de­vice invented by Peter Cooper Hewitt, in which light is produced