Q to Quadrupleexpansion engine
Q. Symbol for electric charge, symbol of merit for an energy storing device, timed circuit etc
Quad. A type body, less than type high, cast in multiples of em lengths, used for spacing out lin~ at the end of praragraphs and for indentions.
Quadrangle. (Arch.) A square or quadrangular space surrounded by buildings, as on college grounds.
QuadranL (I) The quarter of a circle, or of its circumference. (2) An instrument for measuring altitudes.
Quadrant stay. (Furn.) A band of metal used for supporting flaps, falls, and secretary fronts.
Quadraphonics. Now obsolete way of reproducing surrond sound. In fact there were several incompatible quadraphonics system, all of which failed commercially.
Quadrophonic Sound. A much-explored but nevercommerciclly acceptable form of listening which enabled the music or whatever programme material you like to be listened to from all directions via four loud-speakers. I believe that Quadrophonic sound is. better than ambisonics. Ambisonics are only around today because
quadrophonic failed. Quadrophonic sound could be brought back to life by the marketing of four-channel amplifiers and by putting all popular material on cassette. Surely all these years of developing a one-direction, fourtrack transport for compact multitrackers can be made to pay off in domestic consumer market ?
Quadraphony. Surround-sowrd system employing four signals (ma
trix or discrete), in which loud- ' speakers are usually located to left-right-front and left-right-rear of listening area.
Quadratic equations. (Algebra) An equation which contains the square of the unknown quantity but no higher power; a pure quadratic contains the square only; an effected quadratic, both the square and the first power.
Quadrilateral. A plane figure with four sides and four angles.
Quadruplane. (Aero.) An airplane with four sets of wings placed one above the other.
Quadrupleexpansion engine. A compound engine in which steam is expanded four times; first, in a highpressure cylinder, and afterwards in three low-pressure cylinders in succession. The quarfle thread to Quarter-turn belt.
initial steam pressure should be at least 200 pounds.
Quaflruple thread. (Meeh.)A thread in which- there are four distinct helices, making the lead four times the pitch. A quadruple thread is usually of the square or acme type.
Qualitative analysis. (Chern.) The determining of how many and what elements or ingredients are present.
Quality. (I) Degree of goodness. (2) Peculiar power or property.
Quantitative analysis. (Chern.) The determining of the bulk or amount of each element or ingredient.
Quantity. A certain mass, volume, or. number; that property of anything that may be increased or diminished
.
Quantize. To restrict a variable to discrete values, each of which is an integral multiple of the same value.
Quantum. The smallest quantity of "radiant energy, equal to Plank's constant times the freqency of the associated radiation.
Quantum machanics. The branch of mechanics that is applicable to systems at the atomic or nuc1ear level and that is composed of a"theory for a systems in which velocities are small compared to the speed of light, a theory for system in which velocities approach or equal the speed of light and a theory for systems in which particles are created and destroyed.
Quantum number. One of the set of integers or half-intergrs that describes an energy level of a particle or system of particles.
Quantum theory. The theroy, based on Plank's radiation law, that changes of energy in atoms and molecules occur only in discrete quantities, each an integral multiple of a fundamental quantity or quantum.
Quarry. (1) An excavation from which stone is removed by blasting, cutting, etc. (2) A small square or lozenge-shaped pane of glass, plain or decorated, used in forming the glass fronts of eighteenth-century book cases.
Quarry-raced masonry. That in which the face of the stone is left unfinished just as it comes from the quarry.
Quarry tile. (Masonry) Also called "promenade" tile. A name for machine-made, unglazed tile, 3/ 4 in. or more in" thickness.
Quart. Two pints; 1.4 gallon. In dry measure one-eighth of a peck.
Quarter. One of four equal parts of anything. One of the four principal points of the compass.
Quarter bend. A bend through an arc of 90 deg., as in a pipe.
Quarter sawing. Signifies that the log is first cut into quarters. In sawing into boards, the cuts are made parallel with the medullary rays.
Quarter-turn belt. (Meeh.) The arrangement of a belt to drive- two shafts which are at right angles.
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