Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 21
his clockand see its pendulum vibrate to and fro, measuring the secondsof time so accurately, and to think that its vibrations can beheard in all cities throughout this vast land, seems indeed oneof the great achievements of the present century. Pigure 4 shows the instruments used for sending out… … 18 TIME SERVICE OF TODAY. Figure 5 shows the various telegraph instruments of theWestern Union and Postal Telegraph Companies. The eightpoint relay which sends out the current that synchronizesthe clocks, drops the time balls, etc. Lieutenant Hayden standsbefore the instruments with his hand on the…
Clocks and watches
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