Limitation on the Use of the Horizontal Clinostat as a Gravity Compensator

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Abstract
If the horizontal clinostat effectively compensates for the influence of the gravity vector on the rotating plant, it should make the plant unresponsive to whatever chronic acceleration may be applied transverse to the axis of clinostat rotation. This was tested by centrifuging plants while they were growing on clinostats. For a number of morphological endpoints of development the results depended on the magnitude of the applied g-force. Gravity compensation by the clinostat was incomplete. This conclusion is in agreement with results of satellite experiments which are reviewed.