Page:On Polarisation of Electric Rays by Double Refracting Crystals.djvu/7

The following are the different parts of a complete apparatus:—

Fig. 1. Polarisation Apparatus.

B, Metallic box enclosing the Ruhmkorff coil and Radiator.

K, The crystal to be examined. E, Voltaic Cell.

G, The Galvanometer. R, tube enclosing sensitive receiver.

Fig. 2. The Radiator.	Fig. 3. The Spiral-spring Receiver.