Subsequent experience has demonstrated the possibility
of constructing non-injector burners such as that shown in Fig. 13, which
behave satisfactorily even though the jets are oblique. But with such
burners trouble will inevitably ensue unless the gas is always purified
to a high degree and is tolerably dry and well filtered. Non-injector
burners should not be used unless special care is taken to insure that
the installation is consistently operated in an efficient manner in these
respects.
GLOBES, &C.--It does not fall within the province of the present volume
to treat at length of chimneys, globes, or the various glassware which
may be placed round a source of light to modify its appearance. It should
be remarked, however, that obedience to two rules is necessary for
complete satisfaction in all forms of artificial illumination. First, no
light much stronger in intensity than a single candle ought ever to be
placed in such a position in an occupied room that its direct rays can
reach the eye, or the vision will be temporarily, and may be permanently,
injured. Secondly, unless economy is to be wholly ignored, no coloured or
tinted globe or shade should ever be put round a source of artificial
light.
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