For demonstrations of heliotropism and geotropism. Germinating seedlings are pinned to the cork table which is rotated by an electric motor at 5 revolutions per hour 220-240V, 50-60Hz, 5W. The motor is spindle mounted and may be clamped by a thumbscrew so that the plane of the table can be set at any angle. Slow rotation in the vertical or horizontal planes cancel out the effect of gravity and directional light. An acrylic cover is provided for the cork table to shield the seedlings from draughts. Diameter of cork disc is about 100mm. |
