For demonstration of heliotropism and geotropism. Germinating
seedlings are pinned to the cork table which is rotated by an electric
motor at 4 revolutions per hour. The motor is spindle mounted and
may be clamped so that the place of the table can be set at any angle
between horizontal and vertical. An acrylic cover is provided for the
cork table to shield the seedlings from droughts. Diameter of cork
disc100 mm
