aumer's, the ‘Centigrade, glass vessel, G, from which the air has been drawn by means elder boys know as the pressure of the atmosphere upon the of an air-pump. Hence the inside of this globe isa vacuum, and Fahrenheit’s—are in the respective proportions of 4, 5, liquid outside. Now, if I heat this… … the column of water. Observe now the bubbles of air going I have now to pass on to a consideration of the vapor of swer for philosophers as an illustration of the balloon of up, and pressing down the liquid column. This pressure is Mongolfier. water. I have here the two gases or substances of which…
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