to the 1" of arc, and by the use of deli- Prof. Newcomb, and pronounced by him and by the cate and accurate mechanism, the relative qualities of Clarks themselves to be as near to perfection as the the two spectra—that produced artificially and that art of the optician can attain, while the… … HH. Counterpoises. Saegmuller, and others, and has met with their entire approval. - Brashear. The power conferred by this grating upon coming , with remarkable clearness and sharpness. The only actual work which has been attempted is a the spectroscope is equivalent to that of at least fifty…
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