General physiology of muscles and nerves / by I. Rosenthal.

  • Rosenthal, I. (Isidor), 1836-1915
Date:
1883
Catalogue details

Licence: Public Domain Mark

Credit: General physiology of muscles and nerves / by I. Rosenthal. Source: Wellcome Collection.

    45/348 (page 25)
    Below the graduations the rod branches into two arms, which again re-unite at a lower point, and within the space thus formed a scale- plate is fixed for the reception of the weights which it is de- sired to apply. Finally the rod ends in two vertical plates of thin talc standing at right angles to each other, and these are immersed in a vessel filled with oil, so that, while offering no obstacle to the upward and downward motion of the ap- paratus, they prevent any lateral movement. In order to deter- mine the extension of the muscle, the graduated rod attached to it must be observed through a lens, and it must be noted which divisional line of the graduated rod corresponds with a thread stretched horizontally across the lens ; weights must then be ap- plied, and the increase in length, which declares itself by an alter- ation in the relative position of the graduated rod and the thread, must be observed. Of course, in calculating the ex- tensibility from the figures thus obtained, the weight of the ap- paratus attached to the muscle must be taken into consideration. Fig. 7. Du Bois-Reymond’s APPARATUS FOR THE STUDY OF ELASTIC EX- TENSION IN MUSCLE.