 | John Finlaison - 1843 - 154 ページ
...wire, which dips into the mercury when the key is depressed, and completes the electric circuit. DD, is the distant dial upon which the signals are to...application of this principle is shown in fig. 3, plate 1, which represents what Messrs. Cooke and Wheatstone designate their needle telegraph. A, is a voltaic... | |
 | Henry Minchin Noad - 1844 - 512 ページ
...stationary over the several letters, and consequently concealed them from view ; but when the current was made to flow, by the depression of a key, the corresponding needle in the distant instrument was deflected, carrying the screen with it, and uncovering the letter, which became exposed to view.... | |
 | Laurence Turnbull - 1853 - 276 ページ
...; FF are screens, thirty in number, each being fixed to a needle, corresponding to the finger keys before described. When no electricity is passing,...the letter, which becomes exposed to view, as at O. In the same magazine, there is an improvement suggested by a correspondent, which is obviously a good... | |
 | Laurence Turnbull - 1853 - 272 ページ
...shown; FF are screens, thirty in number, each being fixed to a needle, corresponding to the finger keys before described. When no electricity is passing,...uncovering the letter, which becomes exposed to view, as at 0. In the same magazine, there is an improvement suggested by a correspondent, which is obviously a... | |
 | George Bartlett Prescott - 1860 - 496 ページ
...needle, corresponding to the finger-keys before described. When no electricity is passing, these screws remain stationary over the several letters, &c., and...uncovering the letter, which becomes exposed to view, as at 0. VAIL'S PRINTING TELEGRAPH. The printing telegraph of Alfred Vail was proposed in September, 1837.... | |
 | 1844 - 768 ページ
...stationary over the several letters, and consequently concealed them from view ; but when the current was made to flow, by the depression of a key, the corresponding needle in the distant instrument was deflected, carrying the screen with it, and uncovering the letter, which became exposed to view.... | |
 | 1852 - 470 ページ
...shown; FF, are screens, thirty in number, each being fixed to a needle, corresponding to the finger keys before described. When no electricity is passing,...uncovering the letter, which becomes exposed to view, as at 0. Fig. 41. In the same Magazine, there is an improvement suggested by a correspondent, which is obyious... | |
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... operator ; E is the end of a conducting wire, which dips into the mercury when the key is depressed, and completes the electric circuit ; DD is the distant dial upon which the signals are to be shown ; FF are screens, thirty in number, each being... 