Rotating disk viscometer, accession no. 53; 1922
Merrill W. Chase Historic Scientific Instrument Collection
Photo by Lubosh Stepanek
Rotating disk viscometer of MacMichael type, used in Alexis Carrel's laboratory in the 1920s by Pierre Lecomte du Noüy. In this instrument, the viscosity is determined by resistance to the rotation of a metal cone immersed in liquid. The disk is suspended by a torsion wire bearing a tiny mirror to record the twist in the wire caused by the viscosity.
Historic Scientific Instrument Collection, Pierre Lecomte du Noüy