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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Enemies of Books by William Blades: where the whole of the fumes are carried at once into the open air.
Unfortunately, I can speak from experience of the dire effect of gas
in a confined space. Some years ago when placing the shelves
round the small room, which, by a euphemism, is called my library,
I took the precaution of making two self-acting ventilators which
communicated directly with the outer air just under the ceiling.
For economy of space as well as of temper (for lamps of all kinds
are sore trials), I had a gasalier of three lights over the table.
The effect was to cause great heat in the upper regions,
and in the course of a year or two the leather valance which hung
from the window, as well as the fringe which dropped half-an-inch
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