We now found that the coherer would respond when the spark coil was operated several feet away.
The primary coil of the spark coil is many times larger than the coil of the bell, that is, it contains many more turns of wire.
As yet, however, it would not respond when the spark coil was more than one foot away.
B is the battery of five cells, C is the spark coil, G is the engine cylinder, f is the spark plug.
They accomplish in a large way what our spark coil does in a lesser degree.
The spark coil sent electric waves out in every direction, and those which hit the metal filings made them cohere together.
We tried a similar experiment, substituting an ordinary electric bell for the spark coil.
Our next step was to put antenn upon the spark coil also, as shown in Fig. 185.
At the proper signal an ether wave was sent out by the spark coil.
Don't try to operate your spark coil with 110-volt direct lighting current without connecting in a rheostat.
|spark coil |
An induction coil used to induce sparks in the spark plugs of an internal combustion engine. See more at induction coil.