Identifier: meddelelseromgr2526denm (find matches)
Title: Meddelelser om Grønland
Year: 1879 (1870s)
Authors: Denmark. Kommissionen for videnskabelige undersøgelser i Grønland Denmark. Kommissionen for ledelsen af de geologiske og geografiske undersøgelser i Grønland
Subjects: Geology Science
Publisher: København, C. A. Reitzels Forlag
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
h air. Thebest remedy is to draw off the fluid into a large bottleand shake it vigorously for some time before recharging theapparatus. If, as in my apparatus, the two bulbs of the absorption-pipette are connected by rubber-tubing it is very easy to emptythem, but the rubber introduces a new source of troubleviz., that the soda-lye may in the course of time dissolve alittle sulphur and thereby acquire the power of absorbingminute quantities of oxygen. A slight yellowish tint indicatesthis state of affairs and such solutions must be immediatelyrenewed. If the narrow part of the burette is graduated, as it oughtto be, in Vioooo parts the difference between the two readingsgives the tension directly, and it is unnecessary to apply correc-tions even if the original volume is not exactly 10000. If greataccuracy is desired, and especially if the determinations aremade at greatly varying temperatures, it becomes necessary tomake allowance for the varying tensions of water-vapour and 347 >
Text Appearing After Image:
Fig. 5. a graduated gas-burette, h compensation-burette, с absorption-pipette, d indexof pressure, e, f, g three-way-taps; connection is established between theburettes and the index of pressure, h screw for the final adjustment of thepressure, г stand for the mercury-pipette, л\Ьеп the air has to be forcedinto the absorption-pipette, к ditto, when the apparatus is closed, I air-bubbles mixing the water-bath, m lens for reading the burette. 348 barometric pressures. Let a determination be made at thebarometric pressure of 740 mm. (P) and the temperature of 15°(tension /=13 mm.), then the real tension of CO^ (B) iscalcutated from the observed tension (& == 2.3) by means ofthe formula 760 or, in the terms of the example, 740—13 X & 760 ^ ■ = -- The Chemical Theory of the Tension. The chemistry of the carbonic acid in seawater appearsto have been very puzzling to the earlier investigators, and theproblem has only been solved in comparatively recent years,through the l

Note About Images