When coal gas is burned, the hydrogen is supposed to be entirely
converted into water vapor, and the carbon to finally escape into the
air as carbon dioxide; and if this were so, every cubic foot of gas
consumed would produce approximately 0.52 cubic foot of carbon dioxide
and 1.34 cubic feet of water vapor, while the illuminating power
yielded by the cubic foot of gas will, of course, vary with the kind
of burner used.
Roughly speaking, the ordinary types of burner give the following
results:
------------------------------------------------------------
| Illuminating | Products of Combustion
| Power in | per
Name of Burner. | Candles per | Candle Power.
| c.f. of gas |------------------------
| Consumed. | Carbon | Water
| | Dioxide. | Vapor.
-----------------+-----------------+------------+-----------
Batswing. | 2.9 | 0.18 c.f. | 0.46 c.f.
Argand. | 3.3 | 0.16 c.f. | 0.40 c.f.
Regenerative. | 10.0 | 0.05 c.f. | 0.13 c.f.
-----------------+-----------------+------------+------------
So that the regenerative forms of burner, by giving the greatest
illuminating power per cubic foot of gas consumed, yield a smaller
amount of vitiation to the air per candle of light emitted.
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