Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 164.— DArsonval Mirror-Reflecting Galva-nometer with Scale and Reading Telescope..

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Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 164.— DArsonval Mirror-Reflecting Galva-nometer with Scale and Reading Telescope..

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