Experimental physiology / by Sir Edward Sharpey-Schafer.

  • Edward Albert Sharpey-Schäfer
Date:
1934
Catalogue details

Licence: In copyright

Credit: Experimental physiology / by Sir Edward Sharpey-Schafer. Source: Wellcome Collection.

    28/184 page 16
    and thence through the primary coil. Before passing back to the cell it is conducted through a small electro-magnet m; the electro-magnet being thus set in action, draws down the iron bar and with it the spring, f ts which leaves the screw and breaks contact so that a break induced e.m.f. is set up in the secondary coil. But, the circuit being broken, the electro-magnet m is no longer active, the bar springs up again, Fig. 20.—Diagram of du Bois-Reymond coil arranged for faradisation with Neef’s hammer. (For description see text.) and contact is re-established between the spring and screw; this produces a make induced e.m.f. in the secondary coil. Thus the spring vibrates to and fro, and break and make induced e.m.f.’s are
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