l offices, where a marvels of this wonder-producing centurj'. Professor Morse's students, and worked on the ex- merchant may buy the use of a wire forfive.'orten, perimental line erected between AVashington and or twenty minutes, as he desires." Baltimore by Professor Morse, with the aid furnished… … instead of one. * . A double vibrator. The two magnets are placed in the same circuit, and each lever arranged so as to cut out the opposite magnet. Albany, >'.¥., Kerns. Its operation is as follows : Upon the battery cir- cuit being closed, magnet A attracts its armature, in- " Typo " by an error…
Telegraph -- Periodicals
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