The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 272
ce to the line nowlaid down, it will only be necessary to substitute the newfor the former instruments. This new apparatus requiresonly a single pair of wires to effect all which the presentone does with five, so that three independent telegraphsmay be immediately placed on the line of the… … Interior. ^// ^ // / /Entrance. Fig. 4.—Application of the Telegraph to Crossings, &c.1 A 2A -—•— ,-.-,-.-,-,^^Hpirap •> K without any previous acquaintance with it, can send a communication and read theanswer. The drawings and letter-press description to which we have referred as…
Architecture · Civil engineering · Science
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