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It has been pointed out that the cathode disintegration depends upon the gas present as well as upon the metal of which the cathode is composed. Hence it was thought interesting to investigate whether the gas in which the mirrors were prepared had any effect upon their reflecting powers for different wave-lengths, especially the short wave-lengths (ultra-violet), owing to the use they might be put to in the construction of interferometers, & c., for the study of this part of the spectrum. The object, therefore, of the present investigation is to test this point and also to find the conditions best suited for the production of the mirrors.
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