Flank to Flat
flanges at the edge to keep it from leaving the rail.
Flank. (Arch.) The side of an arch. (Mach.) The side of gear teeth lying below the pitch line.
Flap. (Aero.) A hinged or pivoted airfoil forming the rear portion of an airfoil, to vary the effective camber.
Flapping angle. (Aero.) The difference between the coining angle and the instantaneous angle of the span axis of a blade of a. rotary wing system relative to the plane prependicular to the axis of rotation.
Flare. (Tel.) A white signal generated
in an iconoscope at the edge. of scanning when illumination of these points is low; also halation at points where extremes of light and dark subject matter are adjacent.
Flash. (Plast.) Excess of molding material which runs out of the cut off when the mold is closed. (Weld.) Metal and oxide expelled from a joint made by resistance welding.
Flash butt welding. A resistance buttwelding process, wherein the potential is applied before the parts are brought in contact and where the heat is derived principally from a series of arcs between the parts being welded.
Flash-dry iIik. (Print.) Manufactured from synthetic varnishes and gums. The ink on a printed sheet is set
instantly by intense heat as the. sheet comes from the rollers.
Flasher. (Elec.) A device for flashing on and off a lamp or group of lamps as in some electric signs.
Flashing. (Arch.) Pieces of tin or copper worked in the shingles or slates of a roof or around chimneys and windows to prevent leaking.
Flashing light. (Ae ro.) A light which is intermittent as viewed from a single direction.
Flashing over. (Elec.) Term applied to current passing from one commutator segment to another when the machine is in operation. This is in the form of a ring of fire or a series of sparks jumping from one bar to another, caused usually by faulty insulation of the commu.tator.
Flashlight. (Elec.) A portable electric hand lamp operated by dry cells.
Flashlight IJowder. (Chern.) Two parts of powdered magnesium with one part of potassium chlorate.
Flash lines. (Plast.) Marks formed where the excess material flowed out of a mold.
Flash mold. (Plast.) A mold designed to permit excess molding material to escape during final closing.
Flash point. The degree of temperature at which an oil gives off vapor in sufficient quantity to burn on the approach of a flame o~ spark.
Flashpots. (Tel.) Receptacles filled with flashlight powder and set off electrically by short circuiting.
Flask. (Fdry.) The wooden or metal . frame in which a foundry mold is "rammed up".
Flat. (Print.) Unfolded sheet. Usually sheets up to 17 x 28 in. areFlat arch, or jack arch to Fleming's rule
delivered flat; hence the name.
Flat arch, or jack arch. (Masonry) A construction in which. both the soffits and extrados are flat.
Flat-bed. (Print.) On a press, the flat from which printing is done.
Flat carving. (Furn.) Carving in which only the background is cut out, leaving the design itself flat.
Flat chisel. (Metalwk.) An all~metal chisel used for obtaing a fIat surface on metal by chipping.
Flat drill. (Mach.) A type of drill, its cutting blade having two parallel; beveled edges. Used for drilling out cored holes.
Flat molding. Thin, flat strips used for finishing wood work.
Flat paint. Paint that dries to a lusterless finish.
Flat plate. (Print.) An etched plate with poor contrast.
Flat pull. (Print.) The proof taken with underlay or overlay.
Flat roof. (Arch.). A roof with just enough pitch for drainage.
Flat skylight. (Arch.) A skylight, the entire surface of which is flat, having only sufficient pitch to carry off water.
Flat spin. (Aero.) A spin in which the longitudinal axis is less than 45 deg. from the horizontal.
Flat spots. (Paint and Lacquer) Lack of gloss in spots on a finished surface indicates porous undercoat, or improper surfacing.
Flatter. A kind of hammer used by blacksmiths.
Flating. (Furn.) A veneering process used on buckled veneers. (Paint.) Painting so as not to leave a gloss.
Flat-tube radiator. (Auto.) Made from flat tubes which, instead of running direct from tank to tank, are bent in such a manner that they will be two or three times as long as a straight tube used for the same purpose. This bending retards the flow of water and presents greater cooling surface. It is frequently spoken of as a Honeycomb Radiator, but it is not the true honeycomb type.
Flaw. A crack or fracture in a casting or forging. In general, any defect which may eventually cause failure.
Flax. (Uphol.) A plant which grows from I to 4 ft. in height, in many countries. The seeds produce linseed oil. The fiber from the straw produces linen thread and yarn. The straw called "tow" is used for stuffing upholstered furniture.
Flaxen weave. (Bookbndg.) Tr-ade name for a patter like B A and L W (from linen effect) used on book cloth.
Flaxseed. The seed of flax from which linseed oil is made.
Flax twine. (Uphol.) Used for stitch ing edges, sewing springs to web bing and burlap, sewing mattersses, etc. It is sold in halt'.pound balls.
Fleam. (Woodwkg.) The angle of bevel of the edge of a saw tooth with respect to the plane of the blade.
Fleming's rule. (£lee.) Right-hand rule: If the forefinger points along the lines of flux and the thumb in
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