The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 175
e in their full extent; in particular, it seemsprobable that the range of visibility which I have adopted in the fol-lowing view of the details, falls short of what will be found quite suffi-cient in practice even during the thickest fog.s, when a light so power-ful as that which may be derived… … Referring to the above sketch, I would propose that the lens at Lshould be elevated 24 feet above the rails R R, or about 15 feet above 1841.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 151 as is consistent with a full RtTect from a flame placed in its principalfocus. A more remote observer would…
Architecture · Civil engineering · Science
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