ROTARY PUMP

THIS IS FOR BEST PUMP WHICH HAS BEEN INVESTED FOR PHODUCING BACCUM IT IS WHICH IN ACTION AND CAN EXHAUST LATGE BOLUMES IN A SMALL TIME IT IS OPERATED BY MEAND OF AN ELECTRIC MOTOR AND DOES NOT REQUIRE MUCH ATTENTION IT IS WIDELY USED FOR PRODUCING VAMUUM IN ELECTRIC LAMPS RADIO VALES X RAY TUBES ANS IN LABORATORIES FOR PRODUCINGV CCUMN FOR EXPERIMENTAL PURPOSES IT CONFISS OF ECCENTICALLY MOUVTED ROTATING CYLINDER CALLED THE ROTAR THES IS MOUNYED ON A SHAFT WHICH IS ROTATED AT A HIGH SPEED BY AN ELECTRIC MOTOR THE ECCENTRIC ROTAR RATATES INSIDE A CYLINDRECAL SPACE IN A CETOR CASING.

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VARIABLE IMMERSION TYPE HYDROMETERS

such a hydrometer sinks to different marks in diff rent liquid ans always displace of a hollow cylindrical glass tube G its one and carries on small bulb B while the after ens carries on elongated glass stem s in order that hydrometer may float on in the liquid the bulb is filled with lead shots or Mercury further inside the steam a parer small marked different far different types of hydrometer is placed.

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SUBMARINE

SUBMARINES- sea vessels which can float and move either on the surface of the sea is underneath the watter as may be necessary A submarine has tanks called ballast tank in the front the middle and the rear part when these tanks are filled with sea water the total weight of the submarene increases making it sink below the surface of sea.

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ANEROID BAROMETER

An aneroid baromerer is a barometer in which no liquid used it confisls of a boxof thin carrugated metal from which most of air has been extracted when the air pressure increase the sides are presed closer together and where the pressure secreases the spring s forces the sides further apart by meand of a system of leveal shown in the figher these changes are made to move a pointe which moves over a dial the dial is calibrated by comparison with a merchcry

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EXHAUST PUM

such a pump was invested by von G verick in Germany during 1650. he uded it for producing vacuum and demonstrating the effects of atmospheres presses as which the magdevurg is gemispheres the pump consist of a metalic cylindrical barrel in which a piston can se moved in and out by mend of a piston provided with handle there is a valve v1 at the battom of the cylindrical barrel and another valve v2 in the piston.

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