Page:Researches on Irritability of Plants.djvu/135

112 handle K. The winding disc is attached to the revolving axis of a phonograph motor. The disc is wound in a right-handed direction, which at the same time winds the spring

of the phonograph motor. The circumference of the disc is the same as the length of the recording-plate. One complete turn pulls the recording-plate up to its highest position. A projecting catch below the disc is caught by