Blimp to Blue annealing

Blimp

Blimp. (Aero.) Small nonrigid airship. (Tel.) A soundproof cover for a cine­camera to screen motor sounds.
Blind. Something that obstructs light or vision as screen or shutter.
Blind hole. A hole which does not pass completely through a piece, as distinguished from a "through hole."
Blind mortise and tenon. (Woodwk.) A short tenon fitt~ to a mortise which does not pass completely through the piece, therefore does not show on the opposite side.
Blind tooling. (Bookbndg.) Teetering or ornamentation impressed on book covers without gliding or colour­ing.
Blinder light. (Aero.) A light flash­ing; more than 20 flashes per minute.
Blip. (Aerosp.) A signal indication on the scope of an electronic instru­ment, as that of radar.
Blister. (Aero.) A sheet of clear water raised by the motion of a float or hull and separated from the free­water surface by an air space. (Plas­ter.) Small air pocket or scab like spot on a plastered surface. It oc­curs only in the top coat and is caused by too rapid working. (Plast.) Rounded elevation of the surface of a plastic, with bounda­ries more or less sharply defined, somewhat resembling a blister on the human skin; it may burst and become flattened. .
Blistering. (Paint and Lacquer) Blis­ters or air pockets are generally the result of sealing in moisture, hand smears, or differences in tem­ perature of surface and finishing materials.
Blister steel. (Metal.) Raw steel bars made by the cementation process.
Block. (engine) (Auto. Mech.) The cylinder casting of a multiple cy­ linder gas engine. It includes the. cylinder bores and provision for cooling; either water jackets or cooling fins. .
Block. (Ceram.) A mold made from the original pattern.
Block and tackle. One or more sheaves or pulley blocks and the rope, chain, or cable used in con­nection with same.
Bock chain. (Mach.) A chain as used on bicycles, consisting of unit blocks connected by side links.
Blocking condenser. (Radio) A condenser used in a radio circuit between two points of opposite D.C. potential to prevent a short circuit.
Bloc~ing course. (Masonry) A course of stones placed on the top of a cornice crowning the walls.
Blocki~g out. (Photog.) Elimination of background or details from a negative by opaquing. See Opaquing.
Block letter. (Print.) Heavy, sanserif letter. See Gothic.
Block out. To draw a sketch, write down, or run through the action that a scene or series of scenes will contain.
Block plane. (Woodwkg.) A small plane from 5 to 7 in. in length, used chiefly in working and end grain. It differs from other planes

Blocks, in that it has no cap iron and in having the cutting bevel placed up instead of down.
Blocks, "Jo". (Shopwk.) Shop name for Johannssen measuring blocks. They are extremely accurate and are used for testing the accuracy of other measuring devices.
Block tin. (Plumb.) Pure tin.
Bloom. (Metal.) In the manufacture of wrought iron, the pasty mass of iron is put through a squeezer or is hammered with a steam hammer to remove a portion of the slag, after which it is known as a "bloom." (Masonry) The appearance of efflo­rescence on the surface of a brick wall. (Tel.) The condition of bright illumination in a picture or a por­tion of a picture on the picture tube obscuring picture details. This occurs when an area of white bounces light.
Blower. (Mech. Engin.) A device for increasing draft; used for ventila­tion or the production of blast. (Auto.) A supercharger.
Blowhole. (Fdry.) Hollow cavity in a casting caused by the presence of air or gas in the mold.
Blowhorn stake. (Sheet-Met. Wk.) An implement used by metalworkers, consisting of an upright post, at the top of which arms project on either side; one of these arms is long and slightly tapered; the other, short with a very abrupt taper.
Blowing. (Ceram.) The breaking of ware due to the formation of steam in . too rapid firing.
Blow molding. (Plast.) A method of producing plastic bottles and hol­low ware, by blowing air through a plastic extruded tube or blob against the cool surfaces of a metal mold.
Blown fuse. (Auto. Mech.) A burned­ out fuse.
Blowoff. (Engin.) A valve or drain connection on a steam or hot-wa­ ter boiler so arranged to draw off water and steam with any accumu­lated oil, grease, and dirt.
Blowout. (Auto.) A rupture of both inner tube and outer casing of a tire of such nature as to almost instantaneously exhaust the air.
Blowout coils. (Elec.) Electromag­netic coils in the line circuit of a magnetic switch to cause magnetic stress to extinguish the arc between contacts when the switch is opened.
Blowout patch. (Auto.) A piece of canvas and rubber inserted in a tire casing to reinforce a weak SpOt.
Blowpipe. A tube by which air or gas is blown through a flame for heat­ing, fusing, or melting.
Blowtorch. (Shopwk.) A portable de­vice for securing intense local heat. Used by plumbers and painters.
Blues. A common tern for blue light
filters.
Blowup. (Print.) Enlargement of an
illustration.
Blub. (Plaster.) A swelling or bulging out.
Blue. (Ceram.) The most desired and popular of all ceramic colours. (Colour) A primary colour be­tween green and violet.
Blue annealing (Metal.). A method
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