), the burners devised for the
consumption of acetylene fail to consume properly the mixture of gases
formed by polymerisation from the acetylene. It is difficult to compare
the illuminative value of the several bodies, as they cannot all be
consumed economically without admixture, but the following table
indicates approximately the _maximum_ illuminative value obtainable
from them either by combustion alone or in admixture with some non-
illuminating or feebly-illuminating gas:
________________________________________________
| | | |
| | | Candles per |
| | | Cubic Foot |
|______________|___________________|_____________|
| | | |
| | | (say) |
| Acetylene | C_2H_2 | 50 |
| Hydrogen | H_2 | 0 |
| Methane | CH_4 | 1 |
| Ethane | C_2H_6 | 7 |
| Propane | C_3H_8 | 11 |
| Pentane | C_5H_12 (vapour) | 35 |
| Hexane | C_6H_14 " | 45 |
| Ethylene | C_2H_4 | 20 |
| Propylene | C_3H_6 | 25 |
| Benzene | C_6H_6 (vapour) | 200 |
| Toluene | C_7H_8 " | 250 |
| Naphthalene | C_10H_8 " | 400 |
|______________|___________________|_____________|
It appears from this table that, with the exception of the three
hydrocarbons last named, no substance likely to be formed by the action
of heat on acetylene has nearly so high an illuminative value--volume for
volume--as acetylene itself.
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