Earth, sky, and sea . earthskysea00picc Year: 1956 Appendix 12 Low-pressure Gauge We have seen that the Trieste is provided with four Haenni pressure gauges which measure pressures up to 600 atmospheres, corresponding approximately to depths of 3 J miles. As these pressure gauges cannot have a high sensitivity, it would have been interesting to have at one's disposal a pres- sure gauge with range, for example, corresponding to o to 55 fathoms of depth only. Nothing is simpler than to utilize a normal pressure gauge constructed for these pres- sures. But such an instrument naturally would not
Earth, sky, and sea . earthskysea00picc Year: 1956 Appendix 12 Low-pressure Gauge We have seen that the Trieste is provided with four Haenni pressure gauges which measure pressures up to 600 atmospheres, corresponding approximately to depths of 3 J miles. As these pressure gauges cannot have a high sensitivity, it would have been interesting to have at one's disposal a pres- sure gauge with range, for example, corresponding to o to 55 fathoms of depth only. Nothing is simpler than to utilize a normal pressure gauge constructed for these pres- sures. But such an instrument naturally would not bear high pressures. It would be neces- sary therefore to provide it with a cock that the pilot would have to close as soon as the pressure approached the maximum for which the in- strument was designed. This ^ V/////////W/////777X 4 z^ A O '-A/W\VVW outside /nside I the cab\n ^^wyw Fig. 28. Pressure gauge for use in the shallows solution, however, is not suit- able in practice, for if the pilot, who has many things to think about, forgets this detail, the gauge explodes. Naturally the use of an automatic cock could have been envisaged, but it would be better to find a pressure gauge which, while still being fairly sensitive to low pressures, could without danger bear the highest also. Although it has not yet been designed in detail, I should here like to describe an idea for an instrument which seems to me rather interesting. Fig. 28 gives the principle of it. It is a com- pressed-air gauge intended to be placed in the antechamber, therefore subjected to sea pressure. It is formed by a U-shaped tube in thin glass, of which the base contains mercury (Hg). One arm is open. The other [ 182]
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