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To tell why such results follow the movements we have described we leave to higher authorities; our purpose is to deal with the facts, believing this sufficient for the purpose we have in view.
If you will glance at figure 2 you will see there shown a loop of wire such as has been referred to, mounted upon a shaft having a handle for the purpose of
Fig. 2.
revolving the loop rapidly between the ends of a magnet. This wire is covered with a substance which prevents the electricity passing from it otherwise than through the large pieces of metal, which are arranged about a cylindrical piece of non-conducting material, as a block of wood, in such a manner as not
