Rumford, Benjamin, Graf von, 1753-1814, American Academy of Arts and Sciences · Boston · leaf 173
is fixed in its place areso arranged that the level of the lower part of the roofis about one tenth of an inch higher than the extremityof the glass chimney; and a greater height has notbeen found to be necessary to give a free passage tothe air. These different contrivances defend the lamp… … Management of Light in I Humiliation. 145 within doors, but when the lamp is exposed to thewind in the open air it will stand in need of its protec-tion ; and it is also very useful when the lamp is car-ried about from place to place, to prevent its beingextinguished by sudden jerks. I shall now…
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