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Report on the Scientific Results of the Voyage of H. M. S. Challenger, Vol. 2

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Excerpt from Report on the Scientific Results of the Voyage of H. M. S. Challenger, Vol. 2: During the Years 1873-76 Under the Co... Weiterlesen
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Excerpt from Report on the Scientific Results of the Voyage of H. M. S. Challenger, Vol. 2: During the Years 1873-76 Under the Command of Captain George S. Nares, R. N., F. R. S., And the Late Captain Frank Tourle Thomson, R. N.; Physics and Chemistry

I will first give a general account of the subjects treated, of the mode of conducting the experiments, and of the difficulties which I have more or less completely overcome in the course of several years' work. The reader will then be in a position to follow the full details of each branch Of the inquiry.

The experiments were for the most part carried on in the large Fraser gun fully described and figured in my previous Report. But it was found to be impracticable to maintain this huge mass of metal at any steady temperature, except that Of the air of the cellar in which it is placed. The great thickness Of the College walls, aided by the comparative rnildness Of recent winters, thus limited till the beginning Of the present year the available range Of temperature for this instrument to that from 3° C. To about 1 2° C. As I did not consider this nearly sufficient, and as comparative experiments at the higher and lower Of these temperatures could only be made at intervals of about six months, I procured (in May 1887) a much less unwieldy apparatus. It was made entirely of steel, so as to be of as small mass as possible, with the necessary capacity and strength: and could at pleasure be used at the temperature of the air, or be wholly immersed in a large bath of melting ice. As this apparatus was mounted, not in a cellar, but in a room Sixty feet above the ground and facing the south, it enabled me to obtain a temperature range Of 0° C. To 19° C., with which I was obliged to content myself. A great drawback to the use Of this apparatus was found in the smallness of its capacity. Not only was I limited to the use of two, instead of Six or seven, piezometers at a time but the pressure could not be got up SO Slowly and smoothly as with the large apparatus, and (what was still worse) it could not be let Off SO Slowly. In Spite of these and other difficulties, to be detailed later, I think it will be found that the observations made with this apparatus are not markedly inferior in value to those made with the great gun.

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Titel: Report on the Scientific Results of the Voyage of H. M. S. Challenger, Vol. 2
Untertitel: During the Years 1873-76 Under the Command of Captain George S. Nares, R. N., F. R. S., And the Late Captain Frank Tourle Thomson, R. N.; Physics and Chemistry
Autor:
EAN: 9780267863235
ISBN: 978-0-267-86323-5
Format: Fester Einband
Herausgeber: Forgotten Books
Genre: Geowissenschaften
Anzahl Seiten: 768
Gewicht: 1173g
Größe: H229mm x B152mm x T45mm
Jahr: 2018
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