The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 234
wick is an inch in diameter. Much care is bestowed upon the manu-facture of the lamps for the Northern lighthouses, which sometimes havetheir burners tipped with silver to prevent wasting by the great heat whichia evolved. The burners are also fitted with a sliding apparatus, accuratelyformed, by… … Pig. 2. Pig. 1. is very important, as it insures the bnrner always being in the focns, anddoes not require that the reflector be lifted out of its place every time it iscleaned ; so that, when once carefully set and screwed down to the frame, itis never altered. It will please our readers very much…
Architecture · Civil engineering · Science
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