In places of public entertainment, where large
quantities of coal gas are consumed for illuminating purposes, the
absolute necessity for special ventilation gave rise to the "sun
burner," with its ventilating shaft. This, however, gives but a very
poor illuminating power per cubic foot of gas consumed, due partly to
the cooling of the flame by the current of air produced, and partly to
its distance from the objects to be illuminated.
The great difficulty which in the whole history of ventilation has
opposed itself to the adoption of proper arrangements for removing the
products of combustion has been the necessity of bringing the tube to
carry off the gases low down into the room, and of incasing the burner
in such a way that none of the products should escape; but with the
present revolution in gas burners this necessity is entirely done away
with, and the regenerative burner offers the means not only of
removing all the products of combustion but also of effecting thorough
ventilation of the room itself, as experiments made some few years ago
showed me that a ventilating regenerative burner, burning 20 cubic
feet of gas per hour and properly fitted, will not only remove all its
own products of combustion, but also over 5,000 cubic feet per hour of
the vitiated air from the upper part of the room. I am quite aware
that many regenerative lamp makers raise various objections to fitting
ventilating lamps, these being chiefly due to the fact that it
requires considerable trouble to fit them properly; but I think I have
said enough to show the absolute necessity of some such system, and
when there is a general demand for ventilating lamps, engineering
skill will soon find means to overcome any slight difficulties which
exist.
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