The Philosophical magazine; a journal of theoretical, experimental and applied physics . veral times ; I must, however, addthat without close examination and some experience, the linesmight easUy be passed over. But if instrumental, to what are theydue ? I very much regret that the old spectroscope is not avail-able at present [it had been temporarily sent elsewhere for a specialobject] to enable me to verify the phenomena [In the dramng sent by Mr. Hennessey, the intervals betweenthe dark lines are coloured green, except in the place of the twowhite lines. To transfer this distinction to a wo
The Philosophical magazine; a journal of theoretical, experimental and applied physics . veral times ; I must, however, addthat without close examination and some experience, the linesmight easUy be passed over. But if instrumental, to what are theydue ? I very much regret that the old spectroscope is not avail-able at present [it had been temporarily sent elsewhere for a specialobject] to enable me to verify the phenomena [In the dramng sent by Mr. Hennessey, the intervals betweenthe dark lines are coloured green, except in the place of the twowhite lines. To transfer this distinction to a woodcut, an additionalhorizontal band has been added below, in which only those partsof the drawing which are left white appear as white, while in theupper part the white of the woodcut represents the white or the case may be, of the original.—Gr. Gr. S.] Part of Solar Spectrum, drawn to Kirchhoffs scale, observed at Mus-soorie, N. W. Provinces, India, Lat. N. 30° 28, Long. E. 78° 4 /Height G700 feet above sea {about), with the Spectroscope belongingto the Jiogal Note for diagram.—In course of .studying the solar spectrum foratmospheric lines, •ndth an excellent 3-prism (new) spectroscopebelonging to the Eoyal Society, I gradually extended mv search, Phil. Mag. S. 4. Vol. 48. No. 318. Oct. 1874. X 306 Royal Society:— begiin at the red end, until on arrival at the region about b my atten-tion -was attracted by the fact that K 1 OSTl by no means appearedas the strong line depicted in KirchhofEs map, Plate II. On ex-amining this region carefully, I was surprised to find the colourlesslines shown in the diagram ; these lines, from want of a more ap-propriate name, I shall call white lines (or spaces); they cannot ab-solutely be described as bright lines, yet they closely resembletlu-eads of ^hite floss silk held in the light. The spectroscope inuse, with the most convenient highest-power eyepiece, presentsimages of about two thirds to seven ninths of tho
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