©J.Paul Robinson, Purdue University  BMS 631 - LECTURE1.PPT
Page 19
P.J. Crossland-Taylor
•Sheath Flow Principle
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A Device for Counting Small Particles Suspended in a Fluid through a Tube
P.J. Crosland-Taylor
Bland-Sutton Institute of Pathology
Middlesex Hospital, London, W.1.  June 17, 1952 Nature 171: 37-38, 1953
“Provided there is no turbulence, the wide column of particles will then be accelerated to form a narrow column surrounded by fluid of the same refractive index which in turn is enclosed in a tube which will not interfere with observation of its axial content.”