experiment as detailed there Was To show the pressure of the air, the barometer may steam is invisible, as in each one the flask is filled with be used. A tube twenty to thirty inches long is performed with Italian wine flasks, and is one that steam, though nothing can be seen. Other air pump… … • ( ■ > ■ • EXPERIMENT WITH BALLOON. the entering air will be heard. Thus the flask and The Cunard Steamer XTtriirla. attachments represent an air pump. The Etruria, plying between New York and Liver- This is filled with mercury, and passed tightly through The experiments illustrated in this issue…
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