. Relative spectral transmission of the atmosphere . re all of the same general type, presenting an inter-esting depression in the region of 590 to 640 nnx, with a minimumat about 610 m/x, and a subsequent rise with a maximum near660 m/x. From 660 to 690 m/x there is in all cases a decrease inrelative transmission. In certain instances, notably curves 3,7,and 8, the maxima and minima are very pronounced. In others, Karrer 1Tyndall] Transmission of the Atmosphere 397 such as curves 4 and 6, the minimum at 610 m/x is less clearlydefined. The observations for 3, 7, and 8 were made after a finedri
. Relative spectral transmission of the atmosphere . re all of the same general type, presenting an inter-esting depression in the region of 590 to 640 nnx, with a minimumat about 610 m/x, and a subsequent rise with a maximum near660 m/x. From 660 to 690 m/x there is in all cases a decrease inrelative transmission. In certain instances, notably curves 3,7,and 8, the maxima and minima are very pronounced. In others, Karrer 1Tyndall] Transmission of the Atmosphere 397 such as curves 4 and 6, the minimum at 610 m/x is less clearlydefined. The observations for 3, 7, and 8 were made after a finedrizzle; those for 4 and 6 were made after light showers in theearly hours of the night. Curve 5 pertains to the same night ascurve 4\ the data, however, were obtained after 1145 a. m., whenthe drizzle had ceased and the atmosphere apparently had clearedentirely. Other data which were obtained with the range-finder mirrormounted on the pier are given in curves 1, <?, and 3, Fig. may be classed with the data just presented, so far as relia-. M20 HSO 580 620 660 700 WAVE LENGTH fmeters x icr9) Fig. 12.—Relative transmission of atmosphere; generally rainyNo. i, May 6-7; Nos. 2 and 3, May 8-9, first and second runs bility goes. For these, the condition of the weather may be de-scribed as generally rainy. The curves have a slope from 540 to430 m/x, almost identical with the slope of the curves in Fig. do not, however, show the minimum near 610 m/x, but from540 m/x to about 660 m/x are relatively higher than the other curves,while beyond 660 m/x they are practically identical, within experi-mental errors, with the former curves. Comparison of these twosets of curves shows, therefore, that the most noticeable effect ofa rain in the atmosphere is to increase the relative transmissionin the yellow and orange regions of the spectrum, the maximumrelative transmission lying at about 640 m/x. 393 Scientific Papers of the Bureau of Standards [ The observations repres
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