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86 MEMOIRS O F T H E NATIONAL A C A D E M Y OP SCIENCES. ' A Solar intensities during eclipseâContinued. ID tensities. Relative intensities. Tune Conjugate thermometers VIOLLE'S Conj. VIOLLE'S bulbs. therms. bulbs. a. b Mean A. M. 11 34 0 087 0 049 0.07 . . . - 0.04 . . . . 11 36 11 38 11 40 11 45 11 50 0 0^7 0.049 0 07 . . - - 0 04 . . . . 11 55 0 174 0.142 ' 0. lb . . . . 0 09 . . . . 12 00 0.224 0.190 0 21 . . . . 0 12 . . . . P. M. 12 05 0 316 0 264 0 29 . . . . 0 16 . . . . 12 10 0 453 0 411 0 43 . . . . 0.24 . . . . 12 15 0 506 0 459 0.48 7 6 0 27 0.18 12 20 0 412 0 375 0 39 5 0 0.22 0.12 12.25 0 716 0 657 0 69 15 8 0.39 0 37 12 W 0 910 0 761 0.84 14 6 0 48 0.34 12 35 1 006 0 969 0 99 18 8 0 56 0.44 12 40 1 09i 1.083 1 08 18 5 0 61 0 44 12.45 1 093 1 054 1.07 14.3 0 61 0 34 12 50 1.259 1 228 1 24 22 7 0 70 0 54 12 55 1 330 1 288 1 31 22 2 0 74 0.52 1 00 1 392 1 371 1 38 26 1 0.78 0 62 1 05 1 463 1 459 1.46 29 2 0 83 0 69 1 10 1 449 1 426 1 44 29 2 0 82 0.69 1 15 1 487 1 487 1 49 29 2 0 85 0.69 » 1 I n the preceding table no intensities are given for the V I O L L E bulbs between 11.10 a. m and 12,10 p. m., because the fraction ' becomes indeterminate in this interval. The «'âan reduction of the observations with the black and bright bulbs freely exposed is not given, because of their approximate character. The former are, however, used in drawing the curve previously given under the head " black bulb thermometer." The relative intensities are expressed in the same unit used in reducing all the radiation observations, viz, the intensity m each series at 12.00 May 1 adopted as 1. I n order to express graphically the observations, the following chart is given. I n it the relative intensities obtained with the conjugate thermometers are represented by © and the curve drawn through them. A query, ?, at the side of the observation indicates that the sun was in a cloud at the time, which has been taken account of in drawing the curve. The dotted line is used to connect the observa- tions with the V I O L L E bulbs, but 'no curve is drawn, since it is evident that its position would be quite conjectural, on account of the slow recovery of the instruments from the effects of the. passing clouds. The broken curve at the top ot the chart shows the usual form of the curve of intensity given by the conjugate thermometers, reproduced here for the sake of comparison. A n examination of the observations and the results of the computation leads to the following conclusions: 1. The readings of all the instruments were essentially the same at the close of totality, and agreed with the observed air temperature. This indicates that during the total phase no heat was received by the earth from the atmosphere, as far as these instruments allowed its measure- ment. I t need hardly be said that the radiation instruments are not intended to show the effect
tig. 14. CHART O F R E L A T I V E INTENSITIES O F SOLAR RADIATION DURING ECLIPSE 1030 12J0 100 X1S\ motive Mensity -TOO V-090 hO'U) Coi^jngate thermomctors Violle'a bulba Normal values by oonj tlior Voce >
