Figure 10. RPM readings. Arrows indicate points where central axis measurements were taken (numbers 1 to 4). To the right of the figure is the tachometer photo and contact used. Optical measurements were performed at points 1 to 3 by means of reflected laser reflective tape attached to shaft surface. Measurement was obtained via the contact technique at point 4, due to its location.

From

A New Electronically Monitored Centrifuge for the Analysis of Plant Growth in Simulated Hypergravity

M. J. A. Nava, T. Russomano, M. A. dos Santos, L. B. Poehls

American Journal of Medical and Biological Research. 2015, 3(4), 88-94 doi:10.12691/ajmbr-3-4-2