An Unabridged Printing Of The Seventh Edition, Subtitled: A Handbook For Electricians And Operators. 1. Origin Of The Electric Current - Galvanic Batteries 2. Electromagnetism 3. Telegraphic Circuits 4. The Morse, Or American Telegraphic System 5. Insulation 6. Testing Telegraphic Lines 7. Notes On Telegraphic Construction 8. Hints To Learners 9. Recent Improvements In Telegraphic Practice 10. Appendix And Notes.

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