Valve port to Varying

Valve port to Vane type pump

"

Valve port. (Auto.) Opening into or from the combustion chamber which provides a channel for the passage of gases and a seal for the head of the valve.
Valve push rod. (Auto.) SEE PUSH ROD. Valve retainer. (Auto.) Same as "keeper." It may also apply to any locking device which keeps the valve and spring in position.
Valve push rod. (Auto.) SEE PUSH ROD.
Valve retainer. (Auto.) Same as "keeper." It may also apply to any locking device which keeps the valve and spring in position.
Valves. (Auto.) Those devices which control the flow of intake and ex­haust gases to and from the engine cylinders. On automobile engines, they are called poppet valves.
Valve seat. (Auto.) That part of the engine block machined to receive the poppet valve and provide a seal against leakage of gases.
Valve-seat inserts. (AlltO.) Rings of alloy steel pressed in position in the valve ports to increase the life of the valve seats.
Valve spirng. (Auto.) A compression­type spring exerting pressure of 40 . to 90 pounds to keep valves in closed position.
Valve stem. (Auto.) The shank of a poppet-type valve.
Valve-stem clearance. (AlltO.) Dis­tance between lower end of valve stem and valve tappet. Its purpose is to care for expansion due to heat. Valve timing. (Auto.) Proper setting of valve actions with reference to piston position.

Valve voltmeter. Voltage measuring instrument employing valve cir­cuitry.
Vanadium.. (Metal.) A rare silver­white metallic element, valuable in the making of an alloy steel. Vanadium steel is used in parts subject to shock, as automobile axles.
Vanadium steel. (Metal.) Generally contains between 0.10 to 0.15 per cent of vanadium. Such steel can be forged readily but must be heated gradually. Chrome vana­dium or nickel vanadium steels are used more than plain vanadium steels.
Vandyke brown. (Paint.) A native earth, being a caly stained with a 'bituminous compound. It is used in mixed paints on account of its deep shade.
Vandyke paper. (Draw.) Is a sensi­tized paper which is printed in the same manner as blue print paper, except that the tracing is put in the printing machine with the ink lines toward the paper. This produces a negative with brown background and white lines. This negative is used like ,a tracing to produce a print which has white background and brown lines. Blueprints can also be made from sl!ch a nega­tive, in which case the background is white and the lines blue.
Vane. (Arch.) A weathercock for in­ dicating the direction of the wind.
Vane-type pump. (Auto.) Consists essentially of a circular impeller, set off center in a body casting, having two vanes or wings. Oil is

Vane type super charger to Varying speed motor drawn in after one vane and carried I on ahead of the next vane until it is . forced out through the feed lines.
Vane-type. super-charger. (Aero.) A positive-displacement rotary blower having an eccentrically located ro­tor provided with one or more vanes.
Vanishing point. (Draft.) A term used in perspective to designate the point toward which all parallel receding lines converge or meet.
Vapor. (Auto.) Gas, steam, or mixture of gasoline and air.
Vapor heating. (Bldg. and Engin.) Broadly a type of warming buildings consisting of a two-pipe gravity return system of steam circulation in which provision is made to retard or prevent the passage of steam from the radiator into the return main, and in which the air from the system, as wel1 as the condensed water, is carried back to a point the air is expelled from the mains and the water is returned to the boiler.
Vaporize. (Chern.) To convert into a state of gas or vapour. Vaporizer. An early type of carburetor. Vapor lock. A stoppage or diminution in the fuel flow Of an engine caused by fuel vapor accumulating in the fuel lines.
Varistor. (Elec.) A two electrode semi­conductor device having a voltage­<;Iependent nonlinear resistance.
Variable. (Algebra) A quantity which may change in value while that of others remains constant.
Variable condenser. (Elec.) Type of ondenser in which the capacity can be varied within certain limits.

'Variable inductor. (Elec.) Usually a single coil with some means of varying its properties .of self-in­duction.
Variable motion. (Engin.) When a body moves over equal spaces in unequal times the motion is siad to be variable.
Variable-pitch propeller: (Aero.) A propeller whose blades are so mounted that they may be turned about their axes to any desired pitch while the propel1er is in rotation. Variable reluctance. Magnetic trans­ducer principle used in some phono cartridges. A species of moving­iron transducer.
Variable resistance. (Elec.)A resist­ance that can be adjusted or changed to different values.
Varigroove. Systrn of variable groove spacing on microgroove records in accordance with musical dynam­ics. Permits accommodation of more recording time per radial cm. of disc.
Variomatrix. Logic enhancement system employed by Sansui for both quadraphonic and stereo sig­nals.
Varnish. (Paint.) A solution of cer­tain gums, in alcohol or oil, used
for producing a hard, shiny finish' on a surface. Varnishes are either clear or coloured.
Varying duty. (Elec.) That demand which requires operation of loads of varying quantity for intervals of time, both of which may be sub­ject to side variation. .
Varying speed motor. (Elec.) A