. Carnegie Institution of Washington publication. ous deduction of all the path-differences in my next Report tothe Institution, where they will be sustained in detail by experiments. 146 INTERFEROMETRY OF SPECTRA. out clearly if the last equation for d is used. In case of corresponding increments dd and 8 (A 0), this equation is equivalent to bR But if L is the length of the telescope and 8n the micrometric displacement offringes in the ocular corresponding to dd, 5n L whence 5n bRL Thus if e, the difference in thickness of the corresponding half-silver mirrors,and dn be each even as large as
. Carnegie Institution of Washington publication. ous deduction of all the path-differences in my next Report tothe Institution, where they will be sustained in detail by experiments. 146 INTERFEROMETRY OF SPECTRA. out clearly if the last equation for d is used. In case of corresponding increments dd and 8 (A 0), this equation is equivalent to bR But if L is the length of the telescope and 8n the micrometric displacement offringes in the ocular corresponding to dd, 5n L whence 5n bRL Thus if e, the difference in thickness of the corresponding half-silver mirrors,and dn be each even as large as mm., and d a kilometer, d=io5cm., e=io2cm., b = 200 cm., .R=iocm., L = 5ocm., 5w=io~2cm. io10Xio-2Xio-2od= - - = io cm. 200X10X50 With these very moderate estimates a distance of i kilometer should bemeasurable to 10 cm., so far as the glass-paths of the interferometer areconcerned. THE INTERFEROMETRY OF REVERSED ANDNON-REVERSED SPECTRA PART II BY CARL BARUS Hazard Professor of Physics and Dean of the Graduate Department in Brown University.
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