Enrichment. Embellishment. The addition of ornament to plain work.
Ensemble. The work considered as a whole. not in part.
Entablature. (Arch.) The uppermost member of a" classical order sometimes considered as all that portion above the column.
Entasis of a column. The slight bulge in the middle of a column, to avoid the hollow appearance which would result if it were made straight.
Entrance switch. (Elec.) The switch to which the wires entering a bu~lding are connected.
Entropy. (Phys.) The thermodynamic function; an index of the relative amount of unavailable energy in a physiochemical system.
Enumerated. Named one by one; specified singly.
Enve-lope corner card. (Print.) The address printed in the upper left hand corner of envelopes.
Eosin. (Chern.) A reddish coloring matter derived from coal tar; used in dyeing cotton, silk, and wool; for making red ink and pink lakes.
Epicy cloid. (Georn.) A curve formed by a generating circle rolling upon and outside a fundamental circle.
Epitaxy. The process of growing a thin of material upon a single crystal substrate so that the lattice structure is identical to that of the substrate.
Epoxy resins. (Plast.) An indispensible plastic, made by the reaction of bisphenol and epichlorohydrin, a family which includes a number of modified types, and all of which are tough, flexible, adhesive, and chemically resistant; a combination of properties rarely found in a single resin. These, together with exceptionalloy low shrinkage and excellent electrical properties have been responsible for the wide acceptance of the resin in almost all industries, especially for protective coatings, laminations, casting, and electricla coverings, for aircraft and automotive tooling, and for high performance adhesives. (SEE PLASTICS.)
Epsom salt. (Chern.) Chemic~lly known as magnesium sulphate. It is a colorless, crystalline salt, used medicinally and in the finishing of cotton fabrics; also for weighting paper, silk, and leather.
Equal forces. (phys.) Forces which act in opposite directions and balance each other.
Equalizer. (Elec.) Low resistance .wires or bars connecting the points where the armature, series field, and shunt field are joined on all compound generators which are to run in parallel.
Equalizer amplifier: audio. In a pre-amplifier, the circuit which amplifies and flattens" the phono input signal. Needed because phonograph records are not cut with flat frequency response but according to a standard "equalisation" curve. See "RIAA".
Equalizer brake. (Auto. Mech.) An arragement of levers and rods, so designed that pressure applied to the brake pedal or brake lever will be transmitted through one rod to
Equalizer wire. (Elec.) Connection between two compound generators. connected in paralIel through which the equalizing current flows.
Equalizing current. (Elec.) Cun-ent circulating between two compound generators connected in parallel to equalize output.
Equation. (Math.) In mathematics, a proposition expressing the equality of two qualities. A representation of a chemical reaction expressed by symbols.
Equilibrator. A device for establishing equilibrium.
Equilibrium. (Phys.) A perfect balance.
Equivalent. Numbers or quantities numerically equal to each other but expressed in different terms.
Equivalent evaporation. (Engin.) The amount of water a boiler will evaporate, in. pounds per hour, if it received feed water at 212 deg. F. and vaporized it at the same temperature and at atmospheric pressure.
Equivalent monoplane. (Aero.) A monoplane wing equivalent as to its lift and drag properties to any combination of two or more wings.
Equivalent weights of paper.(Papelmkg. and Print.) Used with reference to different papers which have the same basic weight but because they differ in size have different ream weights.
Erase head. Tape-head designed to apply a strong HF magnetic field across a fairly wide gap for erasure of earlier material as tape passes through a recorder switched to record mode.
Erasure. The process of remoyhlg residual magnetic fields from the tape by applying an external magnetic field. This may be accoinplished by either d.c. fields as in computer applications or an a.c. field as in sound recording or bulk erasure.
Erasure, AC. Demagnetisation of tape by an alternating magnetic field which is gradually reduced in amplitude.
Erasure, DC. The removing of previously recorded information by exposing tape to a high unidirectional magnetic field. Not suitable for audio applications.
Erect image. An image seen through a telescope the same way up as if the object were seen with the naked eye.
Erecting. The final building up, or putting together in position. of machine parts or strcutral parts.
Erosion. (Geol.) A wearing away as of material, particularly rocks or soil, as by water. A physical action distinguished from con-osion; a chemical action. which is a rusting or oxidizing. (SEE CORROSION.)
Errata. (Print.) A list of en-ors of
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