For demonstration of heliotropism and geotropism. Germinating seedlings are pinned to the table, which is rotated by an electric motor at 4 revolutions per hour. The motor is spindle mounted and may be clamped by a thumbscrew so that the plane of table can be set at any angle between horizontal and vertical. A plastic cover is provided for the table to shield the seedlings from draughts. Supplied with 3-core AC mains cable.

Powered by the potential energy stored in the coil of spring strip. Gear driven mechanism, takes one revolution every 15 minutes, i.e., 4 revolutions per hour. Can be used in both horizontal as well as vertical position. With ON/OFF mechanism.