. Carnegie Institution of Washington publication. 96 DISPLACEMENT INTERFEROMETRY APPLIED TO water. Since the total air-pressure is above 1,000 cm. of water, the accuracy of reading is easily within 5Xio~5. But for the secondary disturbances the apparatus would thus be very satisfactory for the purpose, particularly as it admits of observation in an agitated environment. The two divers selected for these experiments were B' and F' here to be distinguished as B" and F" (fig. 112). The same figure contains the temper- ature changes (t incieasing downward) and the graph p of the correspo
. Carnegie Institution of Washington publication. 96 DISPLACEMENT INTERFEROMETRY APPLIED TO water. Since the total air-pressure is above 1,000 cm. of water, the accuracy of reading is easily within 5Xio~5. But for the secondary disturbances the apparatus would thus be very satisfactory for the purpose, particularly as it admits of observation in an agitated environment. The two divers selected for these experiments were B' and F' here to be distinguished as B" and F" (fig. 112). The same figure contains the temper- ature changes (t incieasing downward) and the graph p of the corresponding barometric pressures in centimeters of mercury. The case of F" with a relatively wide tube below ( cm. diameter) as to absolute air-loss per day d(g/m)/dt, curiously enough, does not differ much from the cases A' and C (wide-mouthed and sheathed) and is actually much greater than the corresponding rate of F' (examined by exhaustion). The mean value of the relative rate per day, r = The water-head excess here was but 20 or 30 cm., so that at high barometer or low temperature, the diver sank permanently (s in fig. 112). Under these circumstances there is always a peak in the curve, owing to increased effective air-loss. This is the solutional effect of high pressure (gas being absorbed by solution) and the largest rate of F" compared with F' may also be referred to the same cause; i, e., the greater mean water-head under which the diver is stored. Finally, the diver remained at the bottom persistently, and further systematic observations were temporarily abandoned. On June 15, however, another observation was made, now under a necessarily reduced head, by the exhaustion methcd. The value of g/m is 91,000, showing that for this diver also the rate of air-loss when the diver is left quite without inter- ference (other than temperature) is as large as during the period of daily ob- servations. The peculiar stationary behavior of the diver as to air-content
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