Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 240
1922.] The Fire-fly as an Illuminant. 225 and the bolometer. We can at best merely decide that the energyradiated is enormously less than that from an equally bright lightof any other type, or that possibly the luminous portion of theinsect is warmer than the non-luminous. But when it comes tothe… … .50 .65/i Luminous efficiencies of carbon lamp (upper curve) and of fire-fly (lower curve; radiations.Area of outer curves are proportional to total radiation; areas of cross-hatched curves to light-evaluated radiations; the ratio of light-evaluated to total radiation is the luminous efficiency.…
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