Nevertheless, it should be recollected that when the
conventional system is retained--useful illuminating effect being
sacrificed to absolute illuminating power--acetylene is made to appear
cheaper in comparison with all weaker unit sources of light, and dearer
in comparison with all stronger unit sources of light than the
accompanying table indicates it to be. In using the comparative figures
given in the table, it should be borne in mind that they refer to more
general and more brilliant illumination of a room than is commonly in
vogue where the lighting is by means of electric light, candles, or oil-
lamps. The standard of illumination adopted for the table is one which is
only gaining general recognition where incandescent gas or acetylene
lighting is available, though in exceptional cases it has doubtless been
attained by means of oil-lamps or flat-flame gas-burners, but very rarely
if ever by means of carbon-filament electric glow-lamps, or candles. It
assumes that the occupants of a room do not wish to be troubled to bring
work or book "to the light," but wish to be able to work or read
wheresoever in the room they will, without consideration of the
whereabouts of the light or lights.
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