. The Philosophical magazine; a journal of theoretical, experimental and applied physics . 66 ., 65 63 ,j 62 5 c/ .; CO , 53 .5 58 s 57 , 56 s 55 .:?/. Second Spectrum of Hydrogen. 343 is also not suited to satisfy the requirements of spectroscopicscience, since in the absence of numbers, or even of a scale,not even approximate wave-length determinations of the fewlines given can be obtained from it. The measurements givenbelow and the drawing constructed from them (PL X. fig. 1)will supply this deficiency, at least to some extent. The spectroscope which I employed is of the usual Steinheilmod
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . 66 ., 65 63 ,j 62 5 c/ .; CO , 53 .5 58 s 57 , 56 s 55 .:?/. Second Spectrum of Hydrogen. 343 is also not suited to satisfy the requirements of spectroscopicscience, since in the absence of numbers, or even of a scale,not even approximate wave-length determinations of the fewlines given can be obtained from it. The measurements givenbelow and the drawing constructed from them (PL X. fig. 1)will supply this deficiency, at least to some extent. The spectroscope which I employed is of the usual Steinheilmodel, and when a powerful Rutherfurd prism is employed,shows the spectrum in great detail. The dispersion, which was somewhat greater than that oftwo ordinary flint-glass prisms of 60°, might, with the meansat my command of rendering the gas luminous, have beensomewhat increased ; but little would have been gained bythat, since the rest of the spectrum was not of sufficient inten-sity to bear a higher dispersion. The magnifying-power of93 employed in the first series of observations was increasedto 170 with the remaining series, since the brightn
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