Escalator. A moving stairway such as is used in stores, railroad stations, etc.
Escalop shell. (Furn.) The cockleshell ornament.
Escapement. (Horol.) A device for converting vertical motion into reciprocating motion. It secures unifromity of movement in timepieces. .
Escape velocity. (Aerosp.) The speed a body must attain to overcome the earth's gravitational field and escape into space.
Escritoire. (Furn.) A small writing desk.
Escutcheon. (Arch. and Furn.) The plate about a keyhole or the one to which a door knocker is attached.
Escutcheon pins. (Furn.) Small roundhead nails, usually brass, for attaching escutcheons. .
Esparto paper. (Paper) A paper made from esparto grass pulp chiefly in Europe. It has high-grade bulking and finishing qualities.
Essex board measure. (Shopwk.) Means for the rapid calculation of board feet.
Ester. (Chern.) An organic salt; a compound theoretically obtained by the reaction of an organic base and acid. e.g. CH~C7Hp~ is methyl salicylate. (Plast.) In plastics, the reaction product of an acid and an alcohol. Also the reaction product of fatty acids and alkalis.
Estergum. (Chern.) Used in the manufacture of spar varnish. Made from rosin and glycerin.
.. Estimating. (Masonry amd Bldg.) Calculating the amount of material required for a piece of work, the labor required. and the value of the finished product.
Etching. A process of engraving or marking, in which lines are scratched with a needle on a plate or other surface covered with wax, and the parts exposed are subjected to the action of an acid.
Ethane. (Chern.) A colorless gaseous compound (C2H6) contained in the gases given off by petroleum, and a illuminating gas.
Ethanol. (Chern.) (C2HsOH) Ethyl
alcohol.
Ether. (Chern.) (C2Hs)P This compound is made by treating alcohol with sulphuric acid. Either is a colorless 'liquid chiefly used as an anesthetic; also in the manufacture of smokeless powder, in medicines, and as a solv~nt for gums, fats and waxes.
Ethyl. (Chern.) The C2Hs radical. The radical left by the replacement of one atom of hydrogen from ethane.
Ethyl cellulose. (Chern. Plast.) Prepared from wood pulp or cotton linters. Properties are toughness. thermoplasticity and low flammability. Used for injection molding, protection coatings. adhesives, and for wire insulation.
Ethylene. (Chem.) A colorless, inflammable, unsaturated, gaseous compound (C2H4) contained in illuminating gas.
Eucolloids. (Chem. Plast.) Linear polymers of a degree of polymeri
Eutectic. (phys., Metal., and Chern.) To melt readily or at a low temperature.
Eutectic alloys. (Metal.) Such alloys as aluminium and silicon, cadmium and bismuth, cadmium and zinc, silver and lead. They are made up of two metals entirely soluble in each other when liquid but on "setting or freezing" the crystals of the individual metals form.
Evaporate. (Chern.) To convert into a vapor.
Evaporation. Passing off in a vapor; dryirng or concentrating. (Chern.)The change from a liquid to a gas.
Evolute. (Fum.) A wave scroll used on frieze moldings.
Excavation. (Bldg.) A digging out of earth to make room of engineering improvements. A cavity so formed.
Excelsior. (Fum.) Long, fine, wood shavings used as a stuffing in the upholstering of a cheap grade a furniture; mostly used in pack furniture for shipment.
Excess chalking. (Paint and Lacquer) Excess or premature chalking is the result of applying too many coats, lack of proper percentage of binder to pigment, or a heavy porous undercoating.
Exchange. The process of rendering service for service, or selling goods for money, and money and goods, or of tradihg goods for goods.
Excitation of field. (Elec.) Sending of electric current through the turns of wires on the fields of a motor or generator to set up magnetic lines of force.
Excite. (Elec.) SEE EEXCITATION OF FIELD.
Exciter. (Elec.) A small d.c. generator used to supply electricity for the field of the alternator.
Exciter current. (Elec.) The output of a smaller a.c., generator used to supply field current to a larger alternator or generator.
Exciter generator. (Elec.) A d.c. generator used to supply field current to an a.c. generator or alternator.
Exercise. To exert: employ actively; a problem.
Exhaust. (Mech.) The passage through which the speno steam In an engine cylinder is caroied to ohe outeo air or to a coi'denseo.
Exhaust-collector ringe. (Aero.) A circular duct into which the exhaust gases from the cylinders of a radial engine are discharged.
Exhaust fan. (Elec.) A rotary fan used to draw off dust, fumes, etc., as distinguished from a blower fan.
Exhaust manifold. (Auto.) The hollow casting through which the gases from the various cylinders are conducted on their way through the exhaust pipe and through the muffler.
Exhaust pipe. (Auto.) The pipe which extends from exhaust manifold to muffler to carry off ex, haust ~ases. (Mech..) The pipe
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