9 |
| 20 | 3.5 | 55 | 51.5 |
| 6 | 4.0 | 40 | 36.0 |
| 4 | 4.5 | 25 | 20.5 |
| 2 | 5.0 | 15 | 10.0 |
| 0.8 | 7.7 | 10 | 2.3 |
| 0.5 | ... | ... | ... |
|__________________|___________|___________|________________|
Thus it appears that past an orifice or constriction 0.5 mm. in diameter
no explosion of acetylene can proceed, whatever may be the proportions
between the gas and the air in the mixture present.
With every gas the explosive limits and the range of explosibility are
also influenced by various circumstances, such as the manner of ignition,
the pressure, and other minor conditions; but the following figures for
mixtures of air and different combustible gases were obtained by Eitner
under similar conditions, and are therefore strictly comparable one with
another. The conditions were that the mixture was contained in a tube 19
mm. (3/4-inch) wide, was at about 60 deg. to 65 deg. F., was saturated with
aqueous vapour, and was fired by electric spark.
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