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Creation Date

1940

Description

Nickerson "decade" photometer, accession no.36; early 1940s

This instrument, used by Dr. Donald D.Van Slyke, was a practical means of ascertaining the plasma volume of patients. A serum sample was drawn in advance as a "blank". Then Evans Blue dye was injected intravenously and serum, now blue, was drawn again The serum color was matched by switching calibrated blue plastic discs, carried in two "decades" within the drum, into the visual field over the "blank". The dye value was read directly from the slot on top of the drum.

Photo by Lubosh Stepanek

Keywords

Donald D. Van Slyke, Nickerson photometer

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