Spike to Split field

Spike knot to Spirit level

in. proportion.
Spike knot. (Woodwk.) A knot sawed lengthwise.
Spile. (Engin.) A large timber driven into the ground, used as a founda­tion; a pile.
Spills. (Metal.) Cracks or seams which. occur in iron bars of inferior quality, due to careless rolling.
Spin. (Aero:) A maneuver in which an airplane descends along a he­lical path of large pitch and small radius while flying at a mean angle of attack greater than the angle of attack at maximum lift. (Physics)The component of angular of a particle or. atom that the particle has when at rest. .
Spindle. (Furn.) A slender turned rod tapering toward each end, as in the back of a chair. (Mach.) A ro­tating rod or arbor, either hollow or solid;
Spinel. Any of a group of minerals composed principally of oxides of magnesium, alumi~ium, iron, manganese, chromi"rm etc. characterised by their hardness and octahedral crystiIs.
Spinet. (Furn.) A keyed muscial in­strument in use fro~ the sixteenth to the eighteenth century.
Spinner (Aero.)A fairing of approxi­mately conical or paraboloidal form which is fitted coaxially with the propeller boss and revolves with the propeller.
Spinneret. (Plast.) A metal extrusion die with many minute holes for plastic or glass filament extru-sion.
Spinning. (Sheet-Met. Wk.) The form­ing of circular articles in thin sheet metal by pressure applied while it is being rotated in a lathe.
Spinning lathe. (Sheet-Met. Wk.) A lathe used for spinning operations on sheet-metal work. Spiral. A curve formed by a fixed point moving about a center, and continually increasing the distance from it. (Aero.) A maneuver in which an airplane descends in a helix of small pitch and large ra­dius. the angle of attack being within the normal range of flight angles. .
Spiral coupling. (Mach.) A type of jaw coupling which remains en­gaged only when rotating in one direction.
Spil-al gear. (Gear.) Sometimes called "screw gear". One in which a tooth constitutes a part of a helix. (SEE HELICAL GEAR.)
Spiral instability. (Aero.) A type of instability inherent in certain air­planes which becomes evident when the airplane, as a result of a yaw, assumes too great a bank and sideslips; the bank continues to increase and the radius of the turn td decrease.
Spiral spring.. (Mach.) A spring of the type of clock or watch springs.
Spire. (Arch.) A tapering tower; a steeple.
Spirit leveL (Bldg.) An instrument for testing the horizontal and ver­tical accuracy of work. It consists of a glass tube or bulb nearly full of spirit and enclosed in a wood or metal case. When the bubble in the tube is in a central position, it

Spirit varnish to Split field
indicates the accuracy of the work being tested.
Spirit varnish. (Wood Fin.) One which dries through evaporation and contains volatile solvents such as turpentine and alcohol.
Splash lubrication. (Auto.. and Mach.) A method of lubrication accomplished without the aid of a pump, by which a moving part passing through a reservoir of oil is itself lubricated and at the same time throws oil to other parts need­ing lubrication.
Splat. (Furn.) A broad, flat, upright member in the middle of a chair back.
Splay. (Arch.) To make with a bevel, to spread out, to broaden; a slanted or beveled surface.
Splice. (Elec.) The joining of electri­cal conductors by twisting or by a separate splicing device.
Splicing. (Print.) The process of join­ing two or more leads or slugs, for the purpose of obtaining a length equal to their total. Splicing block. Usually a non-mag­netic metal block with a channel that holds magnetic recording tape in precise alignment. Additional straight and diagonal grooves pro­vide. a path for a razor blade to folIow for cutting the tape. This
device is a standard tool for tape editing.
Splicing compound. (Elec.) A rub­ber tape required as the first insu­lating covering over a splice.
Splicing tape. A special, pressure­ sensitive, non-magnetic tape used to join two pieces o~ recording tape. In order to prevent dirt build­up on the recording head or tape guide, and to prevent adjacent layers of recording tape uses a special adhesive. Household cel­lophane tape should never be sub­stituted for splicing tape.
Spline. (Draw.) A flexible rod or rule used by draftsmen in drawing curved lines. (Mach.) An arbor fit­ted with a key or keyway.
Spline miter. (Woodwk.) A miter joint strengthened by a feather (thin strip of wood) inserted in match­ing grooves (splines) cut on the joining faces.
Spline shafL (Auto.) A shaft with a series of lengthwise grooves a por­tion of its length to make a sliding
. engagement with corresponding internal divisions permitting a positive rotation of parts but with a varying length of shaft; e.g., drive shaft of an automobile.'
Split bushing. (Auto.) Any bushing divided lengthwise into two halves, such as a main bearing, or the big end connecting-rod bearing.
Split cotter pin. (Mech.) A pin made of wire whose section is semicir­cular, bent around until the flat surfaces meet. It is inserted in a . hole near the end of a shaft or bolt to prevent the nut from backing off.
Split field. (Elec.) (Auto generator) A 2-pole field winding in which one field is connected to a third brush, the other to the main brush.