Floor to Flux

Floor to Fluid pressure
lighi:. Both arc and incandescent lamps are used.
Floor. (Arch.) (1) That portion of a structure or building on which one walks. (2) A story of a building is often referred to as a floor, as ground floor, first floor, etc.
Floor chisel. (Woodwk.) An all-steel chisel having an edge from 2 to 3 in. wide. Used to remove floor­ boards, etc. '
Floor drain. (Arch. and Plumb.) A fixture used to drain water from floors into the plumbing system. In . homes, floor drains are usually lo­cated in the laundry and near the heating boiler, a,nd are fitted with a deep seal trap.
Floor molding. (Fdry.) The process of making molds on the floor as distinguished from bench molding. Used on large work.
Floor plan. (Arch.) A drawing which shows the length and breadth of a building and of the rooms which it contains. A separate plane is made for each floor.
Floreated. (Furn.) Carved or deco­ rated with floral designs.
Flotation gear. (Aero.) An emergency gear attached to a land plane to permit alighting on the water and to provide buoyancy when resting on the surface of the water.
Flowering dogwood. (Wo~d) Cynoxyloll floridwn. Also known as "boxwood." A small, ornamental tree bearing white flower. Wood is 'very hard and tough; valuable for golfstick heads, tool handles, and scales.

Fluctuation. A variation, an irregu­lar change of movement.
Flue. A pipe, chimney, or passage­ way to carry off smoke. hot air, etc.
Fluid. A substance that yields to any force tending to change its form . whithout changing its volume; con­sisting of particles which move and change in shape but do not sepa­rate.
Fluid drive. (Auto.) A type of con­stant-turque drive mechanism built in the flywheel of an automobile. It consists of two rotors having vanes, these rotors operating in oil. Motion of the driving plate causes oil to impinge upon the driven plate. Slippage between the plates varies inversely as the speed, per­mitting a smooth starting of the car in any gearshift position.
Fluid friction. (Meek) When the par­ticles of a fluid are in motion and the outer surfaces of the fluid are in contact wih solid surfaces the fluid body is divided into numer­ous layers within itself. The fric­tion produced by the slipping of these layers over one another and by rubbing effect between the molecules of the fluid is called fluid friction.
Fluidity. (Plast.) A synonym of vis­cosity.
Fluid measure. (SEE APOTHECARIES' FLUID MEASURE.)
Fluid pressure. Pressure is transmit­ted by fluids in all directions alike. The transmitted pressure is equal in all directions, and is directly pro­

Fluorescent to Flux portional to the area of the surface.
Fluorescent lamp. (Elec.) A tubular lamp operating on the principle of the mercury arc. The ultra-violet. rays given off by the mercury arc activate the fluorescent material with which the inside of the tube is coated.
Fluorine. (Chern.) A colorless, corro­sive, poisonous gas which is de­rived by electrical decomposition of anhydrous hydrofluoric acid.
Fluorite or flour spar. A calcium fluoride occuring in crystalline or granular form. Used as a binder in making abrasive wheels, and as a flux in the manufacture of steel. Found in considerable quantity in Kentucky and Illinois.
Fluoro-carbons. (Plast.)A plastic at­oms. It is unsurpassed in chemical family with a molecular structure consisting of carbon and fluorine and plysical properties such as ex­treme resistance to chemical attack, high heat stability and dielectric strength, but especially for its non­adhesion and low frictional prop­erties. It is used for gaskets, bear­ings, rings, electric components and tape, and for nonadhesiion ap­
plications. (SEE PLASTICS.)
Flush. (Shopwk.) Parts are said to be flush when their surfaces are on the same level.
Flush bolt. A bolt whose head is let into a counterbored hole so that the top of its head rests level with the face of the plates into which it is sunk. Flush head rivet. A rivet, the head of which does not extend above the surface of the plate, etc., into which it is driven.
Flush receptacle. (Elec.) That type of pin or screw shell receptacle which is recessed in the wall, only the plate extending beyond the sur­face line.
Flush switch. (Elec.) A wall switch of the key, button, or toggle type in which the entire device is re­cessed into the wall with only the operating mechanism protruding beyond the face of the plate.
Flush valve. (Plumb.) A valve used for flushing a fixture by using water diectly from the water-supply pipes or in connection with a special flush tank.
Flute. (Arch. and Furn.) A concave channel in a reamer, tap, or drill.
Fluted reamer. A reamer fluited lon­gitudinally, to cut at its sides.
Fluting cutter. (Mach.) Used on a milling machine for fluting taps, reamers, etc.
Flutter. (Aero.) An oscillation of defi­nite period but unstable character set up in any part of an aircraft by a momentary disturbance and
maintained by a combination of the aerodynamic. inertial, and elastic characteristics of the mem­bers itself.
Flux. (Chern.) Any substance or mix­ture, such as alkalies, borax, lime,