File:The American journal of science (1891) (18147683832).jpg

Title: The American journal of science
Identifier: americanjourna3411891newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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112 C. Barus—Compressibility of Hot Water a/nd it from the maximum to zero, and taking the mean volume changes corresponding to a given pressure. When the water does not attack the glass, the fiducial mark (pressure low) at the beginning of the series, is regained at the end. When water attacks glass there is much shifting. The glass was common lead glass and distilled water was used. 4. My introductory work between 0° and 100° contains a mere corrob- oration of some of the results given in §2. As it is not exceptionally accurate I will omit it here. 5. In table 1, the symbols used have the following meaning: L is the observed length of the thread of water, 6 its temperature, and t the mean time of observation, v/ V is the volume decrement due to the pressure^?. Finally ft is the mean compressibility;* i. e. ft^C^/p^v/V). The first series of data were ob- tained at 28°, the next seven series at 185°. Unfortunately I did not observe the time when ebullition commenced, and some subsequent dates are also lacking. After clos- ing the experiments, I noticed that a fine filament of the upper thread of mercury, had run down into the core of the solid silicate below it. Possibly this means that there had been progressive erosion due to water intruding between the mer- cury and the glass. In this respect the observations are uncertain. § 7. 6. To discuss these results I first plotted ^/Fasafunction of p, thus obtaining a series of curves of some- what irregular contour, the charac- ter of which, however, is obvious. This will be more accurately ob- served by plotting ft as a function of the length L of the column, since the time data are incomplete. The result is striking. It shows a mean *It would be useless to calculate (3 by more elaborate means. The correction referred to at the end of this paragraph is such, that if applied, it would accentu- ate the inferences of the text. Its small value appears in § 7.
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20CMu« 300 J\t^

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