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Analysis: Viscosity of the Blood in Narrow Capillary Tubes

563). For example, the viscosimeter of Oswald's type, using a superiorlypositioned reservoir to press blood by its own weight through a vertical capillary was prone to inaccuracies (Fahraeus & Lindqvist, 1931, p. 563). Sedimentation of blood corpuscles resulted in a change in blood concentration as it passed through the capillary tube (Fahraeus & Lindqvist, 1931, p. 563). This complication may have been responsible for the excessive capillary efflux times measured by some workers (Fahraeus & Lindqvist, 1931, p. 562563). In fact, all of the different viscosimeters used in previous research were plagued by red cell sedimentation (Fahraeus & Lindqvist, 1931, p. 562563).

Fahraeus and Lindqvist precluded these difficulties by creating an innovative apparatus which employed rotary motion to maintain blood homogeneity (Fahraeus & Lindvquist, 1931, pp. 563564). The authors provide a description and an illustration of this viscosimeter (Fahraeus & Lindvquist, 1931, pp. 563564). They neglect, however, to mention how 100 mm. Hg pressures were achieved or how temperatures were held constant in their "thermostate". Furthermore, the excessive wordiness of their description makes for difficult visualization of the device. The paper needs a more detailed illustration of Fahraeus and Lindqvist's new invention.

In regard to the results and discussion, however, the data and their analysis seem adequate. Appropriately enough, Fahraeus and Lindqvist used several tables to present their viscosities (Fahraeus & Lindqvist, 1931, p. 565). Also, they provided sufficient elucidation of the methods by which blood specimens of varying plasma viscosities were obtained (Fahraeus & Lindqvist, 1931, pp. 564565). Furthermore, as was called for, they performed control analyses using water and derived experimental values that corresponded well with those that were to be expected (Fahraeus & Lindqvist, 1931, p. 565).

The use of a graph to ...

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Analysis: Viscosity of the Blood in Narrow Capillary Tubes. (1969, December 31). In Retrieved 19:53, November 29, 2015, from
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