Service switch to Sextant
conveys liquid or gas from a main pipe to its places of use. .
Service switch. (Elec.) The switch inserted at the point of entrance of the wiring to a building, control ling the whole installation in the building.
Service tank. (Aero.) A fixed full tank near each power unit, into which fuel from other tanks is pumped and from which the fuel supplying the engine is drawn.
service tee. (Plumb.) A tee having inside thread on one end and on the branch but outside threads on the other end of the run.
Service wires. (Elec.) The supply wires connecting the load in a building to th~ source of supply from a transformer.
Servo control. (Aero.) A control devised to reinforce the pilots effort by an aerodynamic or mechanical relay.
Sesqui-plalle. (Aero.) A form of biplane in which ~he area of one wing is less than half the area of the other.
Set. (Carp.) (I) A small tool for sinking nail heads below the surface. (2) To adjust a tool, as to set a plane bit. (Plast.) In plastics, the moment of solidification in a curing cycle.
Set at zero. (Mach.) To set to a given point from which other adjustments can be made. In lathe work when the gauge line on the tailstock is set at zero the live and dead centers are in alignment.
Setting time. (Plast.) The time required to solidify the fluid resin.
Setover. (Mech.) Transverse movement of a lathe tail stock center on its base to obtain a taper on a turned piece.
Setscrew. (Mech.) A plain screw having a square or other shaped head, used for tightening purposes, and for locking adjustable parts in position. Setscrews are usually heat treated.
Setting-down machine. (Sheet-Met Wk.) A machine used to c1ose down the seams left by the burring machine.
Setting hammer. (Art Met.) Made of square stock with one end of the head bevelled to a sharp edge; the other end is flat. Used for working in corners or against an angle.
Settie. (Furn.) A bench or seat.
Settlement. (Carp.) The unequal sinking or lowering of any part of a structure, usually caused by weakness of foundation, skimping of materials used in the structure, or by unseasoned lumber.
Severy. (Arch.) A compartment in a vaulted ceiling, especially in Gothic construction.
Severs. (Furn.) A costly porcelain manufactured at Sevres, France, used for plaque decoration.
Sewer. (Plumb.) Pipe or tunnel for carrying away sewage or storm water for sanitary purposes.
Sex~ant. (Math.) An instrument for measuring angles in any plane. It is particularly useful on boats as it can be used by an observer who is on a moving object.
.Shackle to Sheating
Shackle. (Mech.) A connecting link or device for fastening parts together; usually in such a manner as to permit of some motion.
Shackle bolt. (Mech.) A bolt passing through a shackle and some other part fastening the two together.
Shade. Degree of luminosity of a colour, as darker or lighter, as produced by mixture of black or white with pure colout.
Shadow mask colour tube. RCA developed standard colour tube; a colour tube equiped with a metal sheet with half a million small holes punched in it. The metal sheet (which. is the shadow mask) is placed between the electron guns, which beam the picture signal and the phosphor-coated screen.
Shaft. (M ech.) An axle or bar, usually cylindrical, used to support rotating pieces, or to transmit power or motion by rotation.
Shake. A split or check in timber which usually causes a separation
of the wood between annual rings.
Shakes. (Arch.) Handmade shingles. Shnk. (Mach.) That part of a tool by
which it is connected to its handle or socket. The smooth shaft of a wood screw jU&t below the head.
Shape. (Shopwk.) To plane metal on a shapero
Shaped noise. Specially selected and shaped spectrum of white noise used for test purpose.
Shapero (Mach.) A metalworking machine on which the work is fastened to a table or "knee", and the tool is moved back-and forth over it by means of a sliding ram.
Shapes. (Engin.) A general term applied to rolled structural metal, as I beams, channels, Z bars, angles, etc.
Sharp sand. (Bldg.) A clean sand containing coarse angular grains.
Shatter-proof glass. (Auto.) Glass now commonly used in automobiles. It consists of two pieces of glass with plastic between to prevent shattering.
Shear. (Engin~) The resistance of a body to bein? Gut by the action of two parallel iorces or loads acting in opposite directions. (Mech.) (1) to cut with shears. (2) A part is said to be "in shear" when it is subject to shearing stress.
Shearing strength. (Engin.) Indicates the strength of a material against a sliding failure.
Shears. (I) A tool with two blades for cutting metals. (2) The ways on which the lathe carriage and tail stock move are called "shears" by some. They may be either V, flat, or any other shape.
Sheathing. (Arch.) Usually wide boards nailed to studding or roofing rafters, to form a foundation for the outer surface covering of the side walls or roof in a dwelling.
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