. The London, Edinburgh and Dublin philosophical magazine and journal of science. at the lower face, the case shown corresponding to 6i thereafter, while the other image corresponds to6>i and 6<i in the two successive diffractions. These slitsshow strong chromatic aberration, but are nevertheless linearand useful. The optical paths for the three lower rays are : transmitted, I, 2yn-f- £/u/cos R ; transmitted-refracted, II, 2yn + efi/cos R + 2e/x cos R;transmitted-diffracted, III, 2yn 4- <?/x/cos R + 2efi cos 0L. These three equations determine the three stationary inter-ferences n\=2e
. The London, Edinburgh and Dublin philosophical magazine and journal of science. at the lower face, the case shown corresponding to 6i thereafter, while the other image corresponds to6>i and 6<i in the two successive diffractions. These slitsshow strong chromatic aberration, but are nevertheless linearand useful. The optical paths for the three lower rays are : transmitted, I, 2yn-f- £/u/cos R ; transmitted-refracted, II, 2yn + efi/cos R + 2e/x cos R;transmitted-diffracted, III, 2yn 4- <?/x/cos R + 2efi cos 0L. These three equations determine the three stationary inter-ferences n\=2eficosR; n\ = 2efxcos6l ; nX = 2efjb(cos Q\ — cos R), discussed in the preceding paper *. If the grating is betweentwo identical plates of glass, these stationary fringes may * C. & M. Barus (/. c). 434 On Interferometry ivith the Aid of a Gratine/. become movable ; for, inasmuch as there is completesymmetry between the rays to be reflected from the mirrorsM and N, the stationary fringes become identical for bothplates of glass, from either of which
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
