TEEMS AND EXPRESSIONS

Shannon News, 30 August 1927, Page 1

TEEMS AND EXPRESSIONS

SIMPLE EXPLANATIONS. The following list is taken from Harmsworlhs’ ‘ Wireless Encyco--1 >i-d in ':: Beat. —The rise and fall of resultant ampii udo due to the combination of oscillations of two different frequen-cii-s. N Dell, Alexander Graham. —Inventor of the telephone, which made radio communication possible, and of other apparatus. Bellini- i'csi Aerial. —An aerial system devised by E. Bellini and A. Tosi, wild! When used in conjunction with speed.L receiving apparatus, can be used to sind the direction of a transmitter with respect to the position of the la ceiver. B.E.M.F.. —This is the abbreviation for back electro-motive force. B.IT. Curve. —Name given to a method of expressing the magnetic permeability of a material. 8..11.P for brake liorsc-power. 1 Bifilar Post. —A kind of terminal, comprising a screwed rod to which is attached one or more terminal nuts. Binding Screw. —An expression often used synonymously for binding post. Binding Wire. —In radio work this is an expression used to describe a fine copper wire for fastening various connections by binding one part to another.

Bipolar.—Having two poles. The term usually refers to a dynamo or motor whose armature rotates between a held magnet having only two poles.

Black Tape.—The name often applied to a form of impregnated mat.oual, such as. linen, .woven in a long length and treated with an insuring mixture. Black Wax. —An insulating compound that can be used in the plastic state.

Block Condenser. —Small fixcd...condonset’, so called from it s general resemblance to a small b’oek of wood or other material. m

Blocking Condenser. —A small fixed, condenser which affects the path of . certain electrical currents accord ing to its position in the circuit. Blowing Motor. —The blowing motor forms part of the equipment in the special apparatus used for highspeed transmission and . reception of radio signals. Blu 0 Glow. — A blue light sometimes visible in an ionic valve, resulting from gas ionising. Bobbin—A reel or spool whereon to wind a coil of wire. Boiling.— A term used in connection with accumulators to denote a state when the plates are gassing very freely and the clectrolyyte is in a state of ebullition. Barnite Crystal rectifier. Box Aerial.—This is an alternative name sometimes used for a frame aerial. Brad field. —A special type of leadin insulator. Brass Foil.—The name of a very thin brass sheet used for such purposes as the construction of condensers, etc. Breakdown Voltage.—Term used to indicate the interruption of a transmitting station during transmission. Bridge.—Teem used in radio for various forms of measuring instruments. Bridging Condenser. —A form of variable condenser consisting in a typical example of subdivided condenser with a mica diaiectric. British Broadcasting Company. — Company formed in 1922 for the purpose of instituting and conducting the broadcasting in Great Britain. Broad Tuning.—Term used in two ways. When the secondary of a coil is separated from the primary the operation is known as loose coupling or sharp tuning, and when the coils are placed together that is known as tight or broad tuning. In transmitting an aerial tuned to given wavelength may actually be compelled to radiate on other wave-lengths, and this is also known as broad-tuning. Budding.— As applied to accumulator plates refers to bent condition, the plates being distorted. Bunsen Cell. —Type of primary cell

notable for its steady and powerfu

current. Bushes. —Circular liners for a hole. Bu't of Mast. —The bottom part of a solid pole which is used as an aerial mast. B W.G. —Abbreviation for Birmingham wire gauge.

By-Pass Condenser. —A by-pass condenser is a fixed condenser placed in such a position, relative to an inductance, that it prevents a steadydirect current from passing, but at the .same time offers practically no resist-

anee to high frequency or modulated H current. H Cage Aerial. —Form of transmit- H ting or receiving aerial built in the H shape of a cage. . H Call Sign.—The' figures and letters H used by a broadcasting station to H identify such station. ■■H