The Centrifuge All hematocrits were putu in the sams’se cenutrifuge, of radius 15 cm. Except where otherwise stated, the hensatocrit.s were spun mit 30(X) r.p.m. This exact speed was measured by the use of a stroboscope; the speed imudicated by the speedometer-mt water gauge-was theus noted accurately ansd thereafter it