Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 388
^IG. 173.—Apparatus to prove Transmission of Pressure in all directions. … Fig. 174.—Ptienmatic Tubes and Carriages, PNEUMATIC DISPATCH. \17HEN the use of the electric telegraph became general, it was found^ * necessary to establish in all large towns branch stations, from whichmessages were conveyed to the central station, or to which they were sent,,either by messengers…
Inventions
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