Stubs gauge to Sunk

Stub's gauge to Sub-structure

involute tooth frequently used in automobile drives. Both addendum and dedendum are shorter than in the standard tooth and the pressure angle is 20 deg. instead of 14Y:z deg.
Stub's gauge. (Engin.) A gauge for measuring the size of wire. Also known as "Birmingham gauge."
Stub tenon. (Carp.) A short tenon. Strocco. (Masonry) Plaster or cement
used for external surfacing of walls.
Strock molding. (Masonry) A mold­ing which is built to the form, on the floor, or on a table, and "stuck" in positin when finished.
Stud. (Arch.) An upright beam or scantling as in the framework of a dwelling.
Stud bolt. A bolt threaded at both ends with blank space between to permit gripping with a pipe wrench.
Stud gear. (Mach.) A gear mounted on a stud; an intermediate gear.
Stuffing box. (Mach.) A recessed chamber through which piston rods or valve stems pass, surrounded therein with packing, and used to prevent leakage.
Stuffing regulator. (Uphol.) A tape­red, needlelike tool from 6 to lOin. long which is used to even out all irregularities in stuffing. .
Stunt or dunt. (Pot.) To crack or split on cooling.
Style. (Furn.) A definite form or de­sign characteristic of a certain school or period.
Subbase. (Arch.) The lowest part of a base.
Subcloud car. (Aero.) An observa­tion car which may be lowered from an airship to a position below the clouds.
Subcontractor. (Engin.) One who contracts to do a portion of a j'ob, receiving his directions from and being responsible to the contractor of the whole.
Subfloor. (Bldg.) A wood floor which is laid over the floor joists and on which the finished floor is laid.
Subframe. (Auto.) An auxiliary frame placed inside the main frame to support the power plant. Subhead. .(print.) A secondary titleor head.
Sublet. (Engin.) To engage a subor­dinate contractor to handle a piece of work.
Subrail. (Arch. and Bldg.) A molded member or shoe planted on the top edge of a stair string to carry the lower end of the baluster.
Substance. (Papermkg.) The basic weights selected as standard num­bers for regular sizes of all types of paper. The weight of book paper can be determined on the basis of ream 25 by 38 in.; the weight of writings, on the basis of 17 by 22 in.A ream 25 by 40 in. is the last substance standard to be suggested. While formerly substance repre­sented the weight of only one ream of paper, in certain paper per thou­sand sheets.
Sub-stratosphere. That layer of the earth's atmosphere just beneath the stratosphere where high-altitude transport operations are carried on.
Sub-structure. (Arch.) The lower portion of a structure upon whichSubterranean to Sunk molding something else is built up.
Subterranean. Existing, stated or operating below the surface of the earth; underground.
Successive. Following in order, or uninterruptive fluence.
Suction. (Plaster.) The manner in which certain kinds of plaster "pull" when worked with a trowel. The adhesion.
Suction pump. A pump for raising water or other liquids by suction, consisting essentially of a vertical cylinder in which a piston works up and down.
Suction stroke. (Auto.) The intake stroke on which the fuel mixture is drawn into the cylinder.
Suede calfskin. (Leather.) A higher grade leather than suede lambskin. Used for the finer quality of lin­ings.
Suede finish. (Leather.) A lusterless, naplike finish.
Suede lambskin. (Leather.) A soft, pliable, velvet-finished leather used for ladies' handbages, etc.
Sugar pine. (Wood) A very large species of pine native in California and Oregon. Its diameter may be as great as 15 ft. and its height 200 ft. The wood is clear and light in color and easily worked. Much used for building trim, interior and exterior.
Sulphateed.battery. (Auto.) Storage­battery plates that have become covered with a coating of white sulphate due to lack of charging, or to low water level, or to both of these conditions. .If the sulphated condition has not progressed too far, the battery may be brough back by recharging at a very slow rate.
Sulphate paper. (Papermkg.) A paper made entiI:ely of sulphate or "kraft" pulp. It is sometimes bleached white, unbleached, or dyed.
Sulphite bond. (Papermkg.) A hard­sized bond paper which is made in four grades. The two higher grades may be water marked according to Writing Paper Manu-facturers' trade customs. .
Sulphite pulp. (Papermkg.) A pulp made from spruce and similar woods by the sulphite process.
Sulphur. (Chern.) Symbol, S. Its pressence in iron or steel always has an undesirable effect. In very small quantities, it maKes cast iron hard and white. In wrought iron or steel, a mere trace will produce red­shortness.
Sui ph uric acid. (Chern.) H2S04' Oil of vitriol. Made by roasting sul­phur ori'oasting iron pyrites or other sulphide, then adding.oxygen to the resulting dioxide and uniting the produ~t with water. Widely used in the arts and industries in making "pickle," storage-battery electrolyte, refining lubricating oils. etc.
Sump. A 'depression in a roof, etc., to receive rain water and deliver it to the downspout.
Sun compass. (Aero.) A compass in which the direction of the sun is utilized instead of the direction of the magnetic north or south pole.
Sunk molding. (Arch.) Any molding which is recessed below the level of adjoining surfaces.