The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 456
ignal, the length oftime which has elapsed since the trigger was depressed. \Ahen the signalhas returned entirely into the case, the apparatus has resumed its originalstate ready to be again acted upon. Several ingenious modifications of the apparatus are described; and it isstated that the signals… … tte expectations entertained of their eificacy. Detailed drawings of thesignals and machinery accompany the paper. The following description of the apparatus we have obtained from Mr.Curtis, which will more fully explain his ingenious inventions than the pre-ceding brief minutes of the Institution.…
Architecture · Civil engineering · Science
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