Flux density to Foot selector

Flux density to F.o.B
fluorite, etc., used to promote the fusion of metals or minerals.
Flux density. (Elec.) The' number of lines of force or induction per unit' area taken perpendicualr to the in­duction.. Iri free space, flux density and field intensity are the same numerically, but within magnetic material, the two are quite different.
Fly. (Aero.) (I) To operate an aircraft in flight; (2) to ride as a passenger in an aircraft. (Print.) The apparatus which delivers the sheets from a cylinder press.
Fly cutters. (Mach.) Cutters set in a cutter block or chuck held in a lathe or other machine, and used for shap­ing the ends of metal rods or for other formed work.
Flying boat. (Aero.) A form of sea plane supported when resting on the surface of the water, by a hull or hulls providing flotation in addition to serving as fuselages. For the cen­tral-hull type, lateral stability is usually provided by wing-tip floats.
Flying buttress. (Arch.) Consists of a detached pier or buttress connected with a wall some distance from it by a portion of an arch, thus distributing the roof thrust. Has frequent application in Gothic architecture.
Flying disk. (Fum.) Egyptian deco­ ration: a disk with wings.
Flyleaf. (Prill!.) The blank leaf at the front or back of bound books.
Fly title. (Bookbndg.) The title of a book which stands by itself on a page preceding the true title page. Also called half title or bastard title.
Flywheel. (Mach.) A heavy wheel used. in machinery where recipro­cal motion is converted into circu­lar motion to maintain uniformity of motion.Flywheel marking. (Auto.) Marks on the face of a flywheel which serve as a guide for the proper timing of valve action in an engine.
F -numbers. (Photog.) Numbers des­ignating sizes of diaphragm open­ings: f4.5, f5.6, etc.
Foamed plastics. (Plost.) Resins cast rigid or flexible, into sponge. in either closed or connected struc­ture, and either dense or open. Foams are made of a variety of plastic types, the rigid forms being widely used for insulation and flo­tation while the flexible kind is common in upholstery. Urethane foam is an example of plastic foam. (See Isocyanate.)
F. o. b. Free on board; an engage­ment to deliver goods on board ship or other carrier without extra charge.

Focallellgth to Foot selector switch

Focal length. Distance between the optical centre of a lens and the image plane (which, in the case of the video camera, is the pickup tube's target area). The distance is measured in millimetres (mm) and determines the angle of view of the lens.
Foci. The.centers from which the end curves of an elliptical figure are struck.
Foil. (Arch.) A leatlike division in ar­chitectural ornamentation, used in groups of three, a trefoil, of four, a quatrefoil, etc.
Folders. (Print.) Usually sheets of. printed matter having only one fold, making four pages.
Folding machine. (Print.) A machine for folding large printed sheets of books, newspapers, etc.
Folding rule. A collapsible instrument used for measuring.
Foliated. (Furn.) Decorated with a leaf design.
Folio. (Bookbndg.) A sheet of paper. folded once. Also a bound book of sheets so folded. (Print.) The page number.
Follow board. (Fdry.) A molding board recessed, or cut away so that the pattern with which it is to be
used will lie in it to the parting line. When using a lollow baorq, no sand parting need be cut.
Follow copy. (Print.) Instruction to the compositor to consider copy correct and make no changes.
Follow dies. (Metalwk.) Two or more punches and dies in one punch holder
and die body arranged so the work is fed from one punch to another until a series of required opera­tions has been completed.
Follower. (Mach.) (I) A whee~ which is driven by another wheel. (2) The roller which operates against a cam face, or the roller and the arm to which it is attached.
Follower rest. (Mach.) A support for lathe work, attached to the carriage. It follows or is opposite the cutting tool, thus preventing the work from springing away from the tool.
Font. The vessel used in the rite of baptism. (Print.) A complete as­sortment of any on size of type.
Foolscap. (Papermkg.) A term used with references to a size of writing paper measuring 13 by 16 in.
Foot. (Furn.) The lowest supporting member of a piece of furniture; the termination of the leg. Variant in form and decoration.
Foot brake. (Auto.) Brake operated by foot action as distinguished from the hand or parking brake.
Foot-candle. (Elec.) The amount of illumination produced by a stand­ard candle at a distance of one foot.
Footing (Arch.) A foundation, as for a column.
Foot lever. A lever worked by the pressure of the foot alone.
Footnote. (Print.) An explanatory note at the foot of a page.
Foot-pound. (phys.) A unit of work; equal to the energy required to raise one pound avoirdupois one foot.
Foot selector switch. (Auto.) The foot switch which controls the high and low headlight Deams.
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