Fig 1. Schematic illustration of the working principles of the centrifuge (left), clinostat (middle) and Random Positioning Machine (RPM, right).
Centrifuges are used for hypergravity experiments. Thereby, the sample (red dot) is rotated around a vertical axis within a certain radius from the axis. Clinostats and RPMs are used for simulated microgravity experiments. Whereas the clinostat rotates the samples around one horizontal axis, the RPM rotates the samples around two perpendicular axes.