Brass rule to Brightness value.

Brass rule. (Print.) A strip of brass, type high, one long edge of which is used as a printing surface.
Bravais lattice. The 14 distinct lattice which can be formed by the arry of representative points in the study of crystal structure.
Brayer. (Print.) A small hand roller used for spreading ink.
Brazed joint. (Metalwk.) Made by brazing, as distinguished from sol­dered, welded, riveted, or screwed joint.
Brazing. (Metalwk.) Joining two or more pieces of metal with an alloy. The joints are cleaned, bound with wire, and sprinkled with borax, then heated until the alloy melts.
Brazing clamps. (Shopwk.) Clamps for holding the ends of a band saw or other work while being brazed.
Brazing metal. An alloy of 2 parts tin and 98 parts copper.
Brazing solder. (Metal.) Or brazing spelter, contains 50-52 per cent copper, 0.55 per cent lead, iron 0.10 per cent, and the remainder zinc. It melts at between 1560 and 1600 deg. F.
Break. (Bldg.) A term meaning any projection from the general surface of a wall or building. (Mech. Drg.)
The indicated omission of a uni­form part of a long object without using a smaller scale.
Breaker. (Auto. Elec.) A mechanical device consisting of a movable arm and stationary post, both faced with metal contacts which interrupt the current passing through, at properly timed intervals.
Breaker arm. (Auto:) Shaped flat metal bar with a contact point of tungsten on one end and a round opening on the other, bushed with fiber, bakelite, or similar noncon­ductor, on which the arm can swing from a metal pin.
Breaker strip. (Auto.) A strip of can­. vas in the side wall of a tire casing to increase wearing qualities.
Breaking joints. (Carp.) The stag­gering of joints to avoid having them come in a straight line.
Break iron. (Carp.) The iron at­tached to the top of a plane bit which serves to curl and break the shavings.
Break line. (Print.) The last line of a paragraph. .
Breaks. (Plaster.) Arrangement of laths with staggered joints; i.e., not all occurring one above an­other in a vertical line.
Breast drill. (Shopwk.) A small mechanism used in the drilling of holes in metal by hand. Power is transmitted from a hand-turned crank, through bevel gears to the drill chuck.
Beast of window. (Masonry) The masonry forming the back of the recess and the parapet under the window sill
Breastsummer. (Bldg.) A beam or lintel flush with a wall or parti­tion which it supports, and car­ ried by the side walls or pillars, as a beam over a store window.

Breeder. Fusion machine in which further fuel (tritium) is bred from lithium.
Brevier. (Print.) That type now known as 8 point.
Brick. A hardened. block of clay, usually of rectangular shape, formed in a mold, dried or burned in a kiln. Used in paving and in building.
Brick facing. (Bldg.) (See Brick Veneer).
Brick pier. (Arch.) A plain, detached mass of masoniy serving as a support.
Brick trowel. (Masonry) A flat, trian­gular-shaped trowel used for pick­ing up mortar and spreading it on the wall. It is larger than the butter­ing trowel.
Brick veneer. (Arch.) A facing of brick applied to a frame or other struc­ture.
Bridge circuit. An arrangement of our electrical elements arranged in a square. The input is applied across two opposite corners and the extent of unbalance in the bridge is ob­served by. a detector connected across the other two diagonally opposite corners.
Bridge or structural engineer. One whose activities are concerned chiefly with the design, construc­tion, and erection of bridges and the steel work of large buildings.
Bridging. (Arch.) A method of brac­ing joists or studding by the use of short strips or braces.
Bridging amplifier. An amplifier with an input impedance at least 10 times the inpedance of the source pro-vi ding the input signal. (See "Bridging").
Bright.' An expression that usually describes a large amount of high frequency energy in a recording or playback system, or a sound rein- .
forcement system. Sound which is too bright is considered to be shrill.
Bright annealing. (Metal.)A method of annealing by which oxidation and discolouration are prevented by using closed containers with a. reducing atmosphere.
Bright dipping. (Metal.) The dipping of metal into a chemical solution to secure and maintain a bright finish.
Brightness. (Tel.) The degree of illu­mination of a picture olithe receiver or picture tube.
Brightness control. (Tel.) A control on the receiver for regulating the overall brightness of the picture.
Brightness ratio. An indication, ex­pressed as a ratio, of the difference between the whitest and the blackest objects in a scene; the range from brightness white to dark­est black as it occurs in the scene being recorded. Too wide a bright­ness ratio can lead to the unaccept­able contrast ratio when the scene is displayed on a TV screen.
Brightness value. Luminance, the relative brightness of a particular object in a scene; the point on the grey scale at which the object is between absolute white, either of which can be used as a point of ref­erence to determine the brightness
. value of the object; essentia:JIy a relative determination made by the observer.