Writing in 1902, Capelle gave for Stadelmann's twin injector burners the following figures; but as he examined each burner at several different pressures, the values recorded in the second, third, and fourth columns are maxima, showing the highest candle-power which could be procured from each burner when the pressure was adjusted so as to cause consumption to proceed at the most economical rate. The efficiency values in the fifth column, however, are the mean values calculated so as to include all the data referring to each burner. Capelle's results have been reproduced from the original on the basis that 1 _bougie décimale_ equals 0.98 standard English candle, which is the value he himself ascribes to it (1 _bougie décimale_ equals 1.02 candles is the value now accepted). _____________________________________________________________________ | | | | | | | Nominal | Best | Actual Consumption | Maximum | Average | | Consumption,| Pressure| at Stated Pressure. | Light in | Candles per| | Litres. | Inches. | Cubic Feet per Hour.| Candles. | Cubic Foot.| |_____________|_________|_____________________|__________|____________| | | | | | | | 10 | 3.5 | 0.40 | 8.4 | 21.1 | | 15 | 2.8 | 0.46 | 16.6 | 33.3 | | 20 | 3.9 | 0.64 | 25.1 | 40.0 | | 25 | 3.5 | 0.84 | 37.8 | 46.1 | | 30 | 3.5 | 0.97 | 48.2 | 49.4 | |_____________|_________|_____________________|__________|____________| Some testings of various self-luminous burners of which the results were reported by R. Granjon in 1907, gave the following results for the duty of each burner, when the pressure was regulated for each burner to that which afforded the maximum illuminating duty. The duty in the original paper is given in litres per Carcel-hour. The candle has been taken as equal to 0.102 Carcel for the conversion to candles per cubic foot.