The essentials of experimental physiology for the use of students / by T. G. Brodie.

  • Brodie, T. G. (Thomas Gregor), 1866-1916.
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: The essentials of experimental physiology for the use of students / by T. G. Brodie. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    Dry Batteries. These are of very great convenience in that they aie always ready for use, do not give off fumes, and contain no fluid ■ M to be spilt. One of the most satis- factory of these is the Obach dry battery, manufactured by Siemens. + In principle, they are usually modified Leclanch6 cells. THE INDUCTION COIL The form of induction coil usually employed by physiologists is Du Bois- Reymond’s sledge inductorium (fig. 6). It consists of a coil, a, of fairly stout insulated copper wire wound on a wooden reel in the centre of which is a core of soft iron wires, c. The number of turns of wire in this, the PRIMARY COIL, varies in different instruments from 200 to 500 or more. The ends of the wire of the primary coil are con- nected to the two binding screws / and h. A second coil of much finer wire is wound round a large wooden bobbin, the whole forming the SECONDARY COIL, b. This is fixed to a wooden foot sliding in a Fig. 5.—The Leclanche Battery. Fig. 6.—The Induction Coil. (McKkndrick.) grooved base, m, and the central cavity in the wooden bobbin is of such a size that the secondary coil may be pushed home so as to completely cover the primary coil a. The terminations of the wire of the second- ary coil are connected to two binding screws, only one of which, n,