Screw chuck to Secondary

Screw chuck to Sealed beak headlight
han!:l and one left-hand. When the steering wheel is turned one half of the nut moves upward and the other half downward; this motion is transmitted to the cross shaft thJough rollers which operate against-the lower ends of the half nuts.
Screw chuck. (Woodwk.) A chuck for a wood-turning lathe, having a projecting screw which serves as live center.
Screw clamp, (Shopwk.) Same as hand screw or hand clamp.
Screw-cutting lathe. (Mach.) A lathe adapted to thread cutting, being equipped with lead screw and change gears. Screw driver. A bar or rod of steel with handle at one end and flat­tened at the other to fit the slots in screwheads. Sc'rew' eye. A wood screw with the head formed into a completely closed ring or circle.
Screw jack. (Engin.) A lifting jack actuated by a square-threaded screw.Scarew pitch gauge. (Mach.) A gauge usually made up of many leaves, the edge of each being cut to a thread of indicated size. Used for determining the number of threads per inch on a given screw. boll, or nut.
Screw plate. (Mach.) Originally a steel plate having holes of diffe­rent sizes which are internally threaded for making screw threads by forcing up the metal. The present use of the term refers to a stock and a halved or solid die.
Screw-slot cutter. (Mach.) A milling cutter used for slotting screw heads.
Screw stock. (Metal.) A shop term for soft steel used for small screws and parts made on screw machines.
Screw threads. (Mach.) Projections left by cutting a helical groove on a cylinder are known as screw threads. Threads may be internal or external.
Scriewl or scriber.A pointed steel . instrument for making fine lines on wood or metal for layout work.
Script. (Print.) Type matter in imita­tion of handwriting.
Scroll. (Futtl.) Ornamentation char­acterized by free-flowing curves.
Scroll saw. (Woodwkg.) A thinbladed saw for cutting curves designed to cut irregular shapes.
Scrollwork. Ornamental work sug­gesting a parchment roll, or work characterized by designs of many curves.
Scutch. (Masonry) A tool resembling a pick on a small scale, with flat cutting edges, for trimming bricks for particular uses. Scutcheon or escutcheon, A metal plate, as around a keyhole.
Sea coal. (Fdry.) Finely ground soft coal. Sealed-beak headlight. (Auto.) The

Sealing compound to Secondary colorcombined assembly consisting of. lens, reflector, and lamps in a sealed vacuum or gas container. A much used form for auto-road lighting.
Sealing compound. (Elec.). PlaStic, nonconducting, acid-resisting compound used to seal-in tops and terminals of a storage cell to pre­vent spilling of acid electrolyte.
Sealing wrappers. (Papermkg.) A I wrapping paper of smooth finish and good strength used for pack­aging paper or cardboard. Seam. (I) The joining of two edges as by. sewing. (2) A sheet-metal joint in which the edge of one piece is folded or turned over the edge of another.
Seaming iron. (Sheet-Met. Wk.) Also called grooving tool. Used for set­ting seams in sheet-metal work.
Seamless tubing. (Mech.) Drawn tub­ing without joints, as distinguished from pipe or tubing with welded longitudinal joints. . Seam welding. A resistance-welding process wherein overlapping or tangent spot welds are made pro­gressively.
Seaplane. (Aero.) Any type of air­ plane which can rise from or alight on water.
Seaplane hull. (Aero.) That portion of a flying boat which furnishes buoyancy when in contact with the surface of the water. It con­tains accommodations for the crew and passengers, usually combin­ing the functions of both float and fuselage.Seasoning modeling. The process of coating plaster models for molds; the molds themselves, and the cases for gelatin molds, with a preparation which will stop ab­sorption.
Seasoning of lumber. (Woodwkg.) By the kiln-drying process, boards are placed in a drying room or kiln to hasten the seasoning. By the air-drying p;ocess, lumber is allowed to dry naturally under sheds.
Seat. (Auto. Mech.) (I) That part of an engine with which the valve comes in contact to make a tight
joint. (2) In valves generally, that stationary part which when the valve head or plunger is in a closed position provides a leakproof con­tact. (.1ewlery) The section or area of a setting that a stone rests upon.
Secant. (Math.) The quotient of the hypotenuse of an angle divided by the adjacent side..
Secondary. (Elec.) A winding or coil which is magnetically coupled with another coil called a "pri­mary."
Sec;ondary color. (Print.) The colours obtained I,)y mixing red, yellow, and blue pigments together in pairs; e.g., red and yellow make orange, yellow and blue produce. green, etc..