Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 255
f wheels, placed one above theother and rotated horizontally in a tank of mineral oil,shown above, by a small electric motor, shown below,which is run by the current that operates the coil ; theupper wheel being notched. The terminals of the electric 232 ELECTRICITY FOE EVERYBODY circuit leading to… … Fig. 104. rupted at each revolution, as this brush breaks contactwith the upper wheel at the notch. When the tank is elevated to its proper position, asshown in Fig. 104, this interruption takes place in theoil, which is a good insulator, and the contacts being im-mersed in the liquid, the spark is…
Electricity
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