File:The Viscosity of the Blood (1906) (14598231918).jpg

Identifier: philtrans03640498 (find matches)
Title: The Viscosity of the Blood
Year: 1906 (1900s)
Authors: Denning, A. Watson, J.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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+ -shaped brass union which had taps onthree of its arms; one of these, C, was in communication with a force pump ,another, B, with a mercury manometer; and the third, A, was connected to the brass tube leading to the viscosimeter. A second brass tube, leading toan exhaust (filter) pump and provided with a tap at D, was solderedperpendicularly into F.E. Before using this accessory apparatus the tap A was closed, air was forcedinto the Winchester until the manometer registered a convenient height, andthe tap C then closed. The liquid in the viscosimeter was now drawn up to the topmost mark (m) by opening the tap D, and thereby connecting to thefilter pump. When D was closed, A was opened, and the one observer withthe stop-watch now noted the time of flow between the middle and lowestmarks on the viscosimeter tube as before, whilst the other noted the initialand final pressure readings and manipulated the taps. 2 D 2 336 Dr. A. du Pre Denning and Mr. J. H. Watson. (May 7, Mercurymanometer
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ToviscosimeCer Fig. 4.—Accessory Pressure Apparatus. Details of Experimental Hemlts. For the immediate purpose of these laboratory experiments, horses bloodwas employed, since the corpuscular elements in such blood have beenestimated by Sir John Mcladyean to be practically identical in shape, thoughslightly less (in size) than those of human blood, viz., about 7 ^ in diameter,and, moreover, horses blood has this distinct advantage that, after an anti-coagulator has been added to it, the corpuscles and other cellular bodies arecomparatively quick in settling, and soon leave a reasonably clear plasma.The objection may, perhaps, be raised that experiments carried out withanimal blood are not, strictly speaking, applicable to human beings, but, aswill be shown in the sequel, such results, although not numerically applic-able, cannot but inevitably lead to deductions and conclusions, the principlesof which are as fundamentally true for human physiology as for animalphysiology. Considerin

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