Ball reamer to Bar iron.

Ball reamer to Band

the grooves in which the balls run.
Ball reamer. (Mach.) A hemispheri­cal rose reamer used in finishing the recess for a ball joint.
Ball stake. (Sheet Metal.) A mush­room-shaped stake used for shap­ing and working curved objects.
Ball tool. (Leather.) A small straight tool, the end of which terminates in a balL Used for producing raised relief designs in leatherwork.
Balopticon. (Tel.) A trade name for a projector used for charts, pictures, or anything not transparent.. Also called balop or telop.
Balsa. (Wood.) A common, second­
growth tree in the West Indies and in Central America. Its structure somewhat resembles basswood and poplar. Its extreme lightness com­
bined with good strength make it a desirable wood for use in airplane construction.
Balsam fir. (Wood) A medium-sized evergreen tree reaching 40 to 50 ft. in height; wood is brittle and not durable. Has little commercial use except for wide sale as Christmas trees.
Balsams. (Chern. Plast.) Natural vegetable exudations consisting of resins mixed with volatile oil. Also products having the physical char­acteristics of the natural balsams but produced by reactions which normally lead to resinous materials.
Balun. Device for converting a bal­anced circuit or line to an unbal­anced condition, or vice-versa. Usually a transformer with appro­priate windings and connections.
Baluster. (Arch. and Bldg.) The sup­ports usually of wood, of the hand­rail of an open stair. (Furn, and Woodwk.)A small pillarorcolumn; one of the units of a balustrade. A splat with the outline of a baluster.
Balustrade. (Arch.) A series of small columns or pilasters surmounted by a top rail or coping .
Bamboo. (/urn.) A tropical, tree-like grass used in making furniture, canes, fishpoles, etc.
Banana oil. (Wood Fin.) "Amyl acetate." A product which gets its
name from its odour, used for mixing finishes for wood and metal.
Banca tin. A flat frieze or fascia run­ning horizontally around a tower or other parts of a building; it usu­ally has a projecting molding at upper and lower edges, the flat portion, between, being orna­mented. In furniture, a narrow inlay of contrasting colour or grain used to embellish a surface. (Bookbndg.) Raised horizontal ridges and plain or gilded creased lines across the backbone of a book.
Band. May refer to the space or spread between selection on a phonogra­phy record. "Guard band" refers to a small space between the indi­vidual recorded tracks on a tape

Banding recording which reduces the change of leakage or crosstalk.
Banding. (Arch., Bookbndg., and Furn.) To decorate with a band, strip, or stripe.
Band iron. Thin ribbon of iron used to protect packing cases in shipment.
Bandpass filter. A network that passes a narrow band of frequencies and attenuates frequencies above and below this band.
Band-rejection filter. Also known as a band-stop filter. A network that greatly attenuates frequencies within a narrow band and passes frequen­cies above and below this band. This type of filter is useful for attenuat­ing an interfering signal.
Band saw. An endless saw running on revolving pulleys, used for cutting work in wood.
Bands. TV satellites operate within two frequency ranges: the widely used C-band, which requires a large
dish antenna for reception, and the more rarely used Ku-band, which works with smaller dishes.
Band twisting. (Shopwk.) A peculiar twist given to a band saw in order to make it coil to advantage for storing.
. Bandwidth. (Tel.) The number of cycles per second in the band of
frequency required to transmit the visual or aural signal. Present tele­vision is transmitted in channels seven megahertz wide, which accommodate both picture and sound signals.
Banddy leg. (Furn.) A curved or bowed leg. A cabriole leg.
Banister. (Film.) The back, as of achair. tmilt to resemble a banister; i.e., with upright slats or bars sur­mounted by a top rail.
Bank. (Aero.) To cause an airplane to incline laterally in order to ac­ com.plish a turn or change of course. Right bank is to incline the airplane. with the right wing down. (Furn.) A long bench of a Middle Ages.

Banker. A stonecutter's workbench.
Banking transformers. (Elec.) The
grouping of transformers to form a group or "bank."
Bank of lamps. (Elec.) A number of electric lamps mounted on a sin­gle base. Often used to indicate the voltage of a generator which is about to be switched into a circuit.
Bar. (Metat., Forg.) A piece of metal longer than it is wide. See Bar Stock. (Print.) The piece of metal across the center of a book chase that prevents it from spreading.
Bar clamp. A clamp consisting of a long bar and two clamping jaws, used by woodworkers for clamp­ing large work.
Barefaced tenon. (Carp.) A tenon
shouldered on one side only.
Bar folder. (Sheet Metal) A machine for folding or edging strips or sheets of metal, for forming an­gles, locks, and square joints, and to run round edges for wire.
Bargeboard. (Arch.) Same as verge board. A board suspended from the verge of a gable. During the last quarter of the nineteenth cen­tury such boards were frequently very ornate.
Bar iron. (Shopwk.) Lengths of iron which are used in forging and in the shops; usually that which is
.flat or rectangular in section.