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RESEARCHES ON IRRITABILITY OF PLANTS
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
Fig. 66—Apparatus for determination of latent period of Mimosa: M, spring motor; W, winding disc; C, projecting catch; K, release handle, pressure of which also completes primary circuit of induction coil; K1, short-circuit key. The automatic break consists of contact-rod adjusted by micrometer screw A.
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
