skylight to Slips

skylight to Sleeve nut
such articles as card cases, coin purses, billfolds, etc.; also for bookbinding.
Skylight. (Masonry) A term applied to high and lofty buildings of many stories, as the modern office build­ing.
Sky wave. A radio wave propagated upward from the earth; whether reflected by the ionosphere or not.
Sky writing. (Aero.) Directing the course of flight of an aircraft in such a manner, while a trail of smoke is being emitted, that the trail froms letters or symbols. Slab. (1) A thin piece of stone, marble, concrete, or the like, having a flat surface. (2) J'he outside pieces cut from a log when sawing it into boards (3) (Metal.) A thick rectan­gular piece of steel for rolling into plates.
Slabbing cutter. {Mach.) A wide­faced, milling cutter with nicked teeth to 'permit an easier cut than would be possible with a plain­toothed cutter.
Slack. (Mech.) Loose; that looseness of parts which must be removed before applied power becomes effective.
Slag. (Fdry.) Impurities fluxed from the cupola in foundry work. (Engin.) The fused refuse sepa­rated in the reduction of ores, used in concrete work and in road con­ struction. Slag cement. Cement made with blast-furnace slag.
Slag hole. (Fdry.) A hole 2 or 3 in. in diameter placed opposite the tap hole in a cupola for the draw­ing off of slag. Slag wool. This material somewhat resembling asbestos is made by blowing a jet of steam through fluid slag. It is nonconducting and noncombustible. Used for insulat­ing. (Engin.) Used as a packing material. It is produced from mol­ten slag just out of the iron blast fUrnace.
Slamming stile. (Carp.) The vertical strip against which a door abuts when closed, and into which the bolt of the lock engages.
Slashing. (Textile) The dressing or siz­ing of yarns in order to prevent them rubbing rough in the weav­ing process. (Wood) The tops, branches, and trimmings which remain after a logging operation.
Slat. (Aero.) A movable auxiliary air­foil, attached to the leading edge of a wing, which, when closed, falls within the original contour of the main wing and which, when opened, forms a slot. (Furn.) A thin piece of wood used in the seat or back of a chair. Sledge. A long-handled heavy ham­mer used with both hands.
Sleeker. (Mold.) A molders tool of a . variety of shapes, used for smooth­. ing rough spots and for removing loose sand from the mold. Also called slicker.
Sleeper. (Arch.) Heavy beam or joist. Sleeve. (Mech.) A hollow tube or cyl­inder which surrounds a rod or shaft.
Sleeve nut. (Engin.) A long adjusting

Sleeve valve motor to Slips
nut with right and left hand threads used to connect two rods.
Sleeve valve motor. (Auto.) A motor in which the valve mechanism con­sists of sleeve and pistons. The valve strokes are controlIed by means of eccentric rods worked from an accentric shaft.
Slice or slice bar. (En gin.) A firing tool, used for breaking up and separating the clinkers on a fur­nace grate.
Slicing cut. (M.ech.) A cut taken with a sliding or slicing motion for the purpose of removing thin pieces.
Slicking. (Fdry.) Smoothing the sur­face of foundry molds.
Slide. A glass plate used in a project­ing lantern for throwing a picture on a screen.
Slide caliper. (Mach.) A pocket cali­per consisting of a graduated bar which slides in a retaining piece.
Slide rest. (Mach.) On a lathe, the parts above the saddle which sup­port the compound rest.
Slide rule. (Engin.) A rule provided with logarithmic numbers arr­anged on a sliding scale.
Slide valve. (Engi1l.) A valve operat­ing with a sliding motion, so ad­justed that the cylinder ports are opened and dosed in proper rela­tion to the piston stroke.
Sliding fit. (Mech.) A running fit. A fitting together of moving parts so snugly that there is no looseness, yet not !So tightly as to interfere with free motion.
Slip. (Ceram.) Clay rcduced to a fluid state by addition of water. (Elee.)The difference in speed between a rotating magnetic field and a rrotor rotating in the field.
Slip bushing. (Mach.)" A jig bushing which is easily removed in order to permit the use of a different size bushing in the same position.
Slip fuel tank. (Aero.) A fuel tank so attached to either airship or air­plane that, in .case of emergency, the tank and contents may be dropped.
Slip function. (A era. ) The ratio of the speed of advance through the undisturbed air to the product of the propeller diameter and the number of revolutions per unit time, i.e., V/nD.
Slip jacket. (Fdry.) A box, open top and bottom, placed over a mold after removal of the snap flask.
Slip-joint pliers. Pilers which permit adjustment to a greater range of opening by a slipping motion of
the two halves about the pin or . rivet which connects them.
Slipping clutch. (Auto.) A dutch which, from wear or glazing or improper pedal adjustment, is not able to transmit full engine power due to a slipping between the pres­sure plate and the driven plate.
Slip plane. (Pfast.) A plane within transparent plastic material due to poor welding and shrinkage on
cooling. It is visible in reflected light.
Slip rings. (Elec.) The means by which the current is conducted to a revolving electrical circuit.
Slips. (Booklmdg.) The ends of the