The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 65
ree such lam])s with different colouredglasses, say white, green, and red, which are required to be some-times lighted, and at other times extinguished or obscured, as isusual on railways, and not all at once, but in a particular order ofsequence, or each under particular circumstances only, I… … Fig. S. metal, having a drop bar B, attached to it. These bars are for tin;purpose of working three extinguishers, one to each lamp. Thefigure shows one of these extinguishers as applied to a lamp ; thedotted lines in the figure indicate the jjosition which it assumeswhen raised up. The drop bar B…
Architecture · Civil engineering · Science
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