53-1.77 | 57.95-58.65 |
| Hydrogen | 9.73-9.96 | 62.75-63.58 |
| Coal-gas | 4.36-4.82 | 23.35-23.63 |
| Methane | 3.20-3.67 | 7.46- 7.88 |
|__________________|________________________|________________________|
Experiments have been made at Lechbruch in Bavaria to ascertain directly
the smallest proportion of acetylene which renders the air of a room
explosive. Ignition was effected by the flame resulting when a pad of
cotton-wool impregnated with benzoline or potassium chlorate was fired by
an electrically heated wire. The room in which most of the tests were
made was 8 ft. 10 in. long, 6 ft. 7 in. wide, and 6 ft. 8 in. high, and
had two windows. When acetylene was generated in this room in normal
conditions of natural ventilation through the walls, the volume generated
could amount to 3 per cent. of the air-space of the room without
explosion ensuing on ignition of the wool, provided time elapsed for
equable diffusion, which, moreover, was rapidly attained. Further, it was
found that when the whole of the acetylene which 2 kilogrammes or 4.
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