Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 233
ady glow of very nearly, if not quite thesame, quality as the flashing light, not so bright as the isolatetlflashes, although very probably of nearly the averaged value ofthese. This steady larval light is much more suitable for measure-ment, analysis, and ultimate copying, if that be possible or… … Illumination of room by diffusely radiating disc at ceiling. of one of the Pennsylvania varieties of fire-fly, much smaller,although perhaps intrinsically just as bright (i.e., as intense perunit emitting area) as the more famous West Indian varieties. The method of measuring the luminous emission…
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