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Updated: May 9, 2025
The apparatus may be employed under the same circumstances as glass and U-shaped water manometers, with the further advantage that the results are registered, and consequently can be more easily compared. The apparatus represented in Figs. 1, 2, 3, and 4 is the invention of Messrs.
And we continued to sink deeper and deeper. The dial was now announcing 40 meters. This was a bit too much for me. I called down to the central and got back the comforting answer that the large manometer was also indicating a depth of over forty meters! The two manometers agreed. This, however, did not prevent the boat from continuing to sink.
For this purpose water manometers have hitherto been employed; but, although the indications given by these are very accurate, their form and weight are such as to render them not easily transportable; and then, again, considerable care is necessary in putting them in place. Mr.
Aime sank manometers filled with air into the sea till the pressure upon them was equal to that of four hundred atmospheres; Berthelot, by the expansion of mercury in a thermometer tube, succeeded in exerting a pressure of seven hundred and eighty atmospheres upon oxygen. Both series of experiments were without result.
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