75 times the light evolved by pure oil-gas; but
that the latent illuminating power of the acetylene is less
advantageously developed if too much of it is employed. As 20 per cent.
of acetylene is the highest proportion which may be legally added to oil-
gas in this country, Borck's results for that mixture may be studied:
______________________________________________________________________
| | | | | | | |
| | | | | | | Propor- |
| | | | Consump- | | Consump- | tionate |
| Kind of | No. of | Pres- | tion per | Candle- | tion per | Illum- |
| Burner. | Burner | sure. | Hour. | Power. | Candle- | inating |
| | | mm. | Litres. | | Hour. | Power |
| | | | | | Litres. | to Pure |
| | | | | | | Oil-Gas.|
|___________|________|_______|__________|_________|__________|_________|
| | | | | | | |
| Bray | 00 | 42 | 82 | 56.
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