File:The American journal of science (1900) (17531354514).jpg

Title: The American journal of science
Identifier: americanjournal491900newh (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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166 C. Bar us—Hot Water and Soft Glass ing. Black stalactites, however, were seen in the tube and the edges were every where rounded, indicating fusion. The result of the experiment was a thorough dissociation of the charge, giving impure water and an insoluble residue of silicate. This mass was again pulverized, charged into the retort and heated for five hours. On opening the cold retort about 100cub cm of black soapy water were removed ; the glass remained black and non-coherent. Ex- cess of water does not, there- fore, favor the present reac- tions. 5. With these definite results in hand, we may next en- deavor to inquire into the quantitative nature of the pres- ent phenomena. Having this end in view I returned to the experiments described in this Journal (vol. xli, 1891) some years ago with the new results incorporated in the present summary. To make the ac- count intelligible it will be expedient to give a sketch of the apparatus used, the essen- tials of which are shown in fig. 3. Here ah is the capil- lary tube, to be cemented belowT into the steel flange for insertion in the compression pump. The capillary tube contains a thread of water $6T/ (lines of sight of an external cathetometer), between visible threads of mercury m, J/, of which the upper one is sealed in position by a terminal thread p, of solid paraffine, kept cold by the jacket of cir- culating water, G. The lower mercury thread, M, transmits the pressure of the force pump to the water, which is thus made to react on the inner wall of the capillary tube at a defi- nite pressure and temperature. The latter is secured by a boiling tube EE, of clear glass, of the kind frequently described
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