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air-pump air-tight apparatus atmospheric pressure barometer barometric column barrel bladder bodies bottom called cistern closed colour column of air column of water common pump compressed condensation cubic foot cylinder density depth of thirty-three descends earth elastic force elastic pressure empty endeavour equal equator exhausted expand fall fifteen pounds fifty miles fill finger flow forms of pumps GAZETTE OFFICE glass tube globe heat highest point impulsive force instrument inverted vessel lecture lighter liquid means Mendip mercury moisture monsoon natural science opening outwards ordinary paper boat partial vacuum particles pipe piston ascends Pitminster quantity of air quicksilver rain receiver rise rush sea breezes sibility south wind space square inch substance suction-pipe sufficient force surface syphon syringe TAUNTON temperature thirty inches thirty-three feet trade wind tropics upper current upwards vacuum is created valve vapour W. A. WOODLEY warm weather weather-glass weight winter woolpacks
Page 46 - In air they exactly balance each other; but when placed under the receiver of an air pump and the air exhausted, the sphere sinks, showing that it is really heavier than the small weight.