(To be continued.) Wonders of the Magnetic Telegraph.—By means of the magnetic telegraph, a clockin New York can be com-pared with another ata distance of two hundred miles quite as accu-rately as two clocks can be compared in adjoin-ing rooms. The time i-equired for the electricfluid to travel… … 181 IHensiiratiort of Supetticeg, {Continued from page 174.) PROBLEM XI. To find the length of an arc A b, the circumference a d b a or the diameter d b beinggiven. A ^^ ^ B
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