Un-mounted glass tube, limbs with a third short limb for connecting a suction tube
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This apparatus is designed to demonstrate to students that volume of air enclosed in the column is clearly visible to students. A wide bore glass tube is mounted vertically in front of a scale graduated 0-60 cm.
Zero corresponds to the inside of the closed top end of the tube. Air is confined in the tube by a coloured oil contained in a metal container fitted with a Bourden type gauge. A tap is fitted to the side of the metal container, for the air inlet tube from the pump. As the pressure in the oil container is increased, oil is forced into the glass tube and volume of contained air and its actual total pressure are directly indicated. The tube is of extra strong glass having very large safety overload margin. As a further precaution, a safety plastic screen is secured over the front. Overall ht. 690 mm approx. Supplied complete with oil.
Dial 100 mm diameter, dial scale 960 to 1060 mb (28-31 in x 0.10 in) figured in black, good quality movement mounted in a polished plastic frame 155 mm diameter with glass in anodised bezel with lug for rear mounting.
Glass tube 90 cm long with bulb on shorter limb.
Jolly Air Thermometer bulb of mounted on a wooden frame that can be fixed at three places – up, middle , & down on the stand.
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