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Book, page 221 / 445 | | | | Argand | Incandescent | |___________|_______________|______________|________|______________| | | | | | | | Red | 650 | 1.45 | 1.34 | 1.03 | | Orange | 610 | 1.22 | 1.13 | 1.00 | | Yellow | 590 | 1.00 | 1.00 | 1.00 | | Green | 550 | 0.87 | 0.93 | 0.86 | | Blue | 490 | 0.72 | 1.27 | 0.92 | | Violet | 470 | 0.77 | 1.35 | 1.73 | |___________|_______________|______________|________|______________| B. Heise has investigated the light of different flames, including acetylene, by a heterochromatic photometric method; but his results varied greatly according to the pressure at which the acetylene was supplied to the burner and the type of burner used. Petroleum affords light closely resembling in colour the Argand coal-gas flame; and electric glow-lamps, unless overrun and thereby quickly worn out, give very similar light, though with a somewhat greater preponderance of radiation in the red and yellow. ____________________________________________________________________ | | | | | | Percent of Total | | | Light. | Energy manifested | Observer. | | | as Light. | | |____________________________|___________________|___________________| | | | | | Candle, spermaceti . . | 2.1 | Thomsen | | " paraffin . . . | 1.53 | Rogers | | Moderator lamp . . . | 2.6 | Thomsen | | Coal-gas . . . . . | 1.97 | Thomsen | | " . . . . . | 2.40 | Langley | | " batswing . . . | 1.28 | Rogers | | " Argand . . . | 1.61 | Rogers | | " incandesce . . | 2 to 7 | Stebbins | | Electric glow-lamp . . | about 6 | Merritt | | " " . . | 5.5 | Abney and Festing | | Lime light (new) . . . | 14 | Orehore | | " (old) . . . | 8.4 | Orehore | | Electric arc . . . . | 10.4 | Tyndall; Nakano |
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