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"." In the digital collection The University of Michigan, An Encyclopedic Survey. https://name.umdl.umich.edu/AAS3302.0002.001. University of Michigan Library Digital Collections. Accessed April 25, 2024.
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The first prism gave a dispersion of 37.9 Ångströms per millimeter at the Hγ line of hydrogen; a new prism installed May 20, 1914, gives 40.3 in the same unit for the same line.