Glass tube 90 cm long with bulb on shorter limb.
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Glass tube 90 mm long closed at one end.
A working model of a clear glass to show and explain the principle involved. It has a cylinder of 25 mm dia and overall lengths of 350 mm, cylinder is provided with non-return float valves and outlet is by means of a side tube.
Jolly Air Thermometer bulb of mounted on a wooden frame that can be fixed at three places – up, middle , & down on the stand.
The whole column of mercury is visible. Scale is graduated in both English & metric systems. Zero point adjustment is carried by a screw clamp attached to glass tube. Complete fitted on a polished wooden board.
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