The London, Edinburgh and Dublin philosophical magazine and journal of science . he harmonic analyser f was curve V=/(&) is u fed to the machine, which thendraws the curve y = <p(x), the whole operation taking but afew minutes. It was found on completing the analysis of some fifty ormore visibility-curves, that the resulting spectra could beclassified under three types ; there were some interestingvariations which would merit a separate investigation, butmost of the cases could be identified at a glance. The three types of visibility-curve are given in figs. 2, 3, * These are no
The London, Edinburgh and Dublin philosophical magazine and journal of science . he harmonic analyser f was curve V=/(&) is u fed to the machine, which thendraws the curve y = <p(x), the whole operation taking but afew minutes. It was found on completing the analysis of some fifty ormore visibility-curves, that the resulting spectra could beclassified under three types ; there were some interestingvariations which would merit a separate investigation, butmost of the cases could be identified at a glance. The three types of visibility-curve are given in figs. 2, 3, * These are not always sufficiently simple as in the case of the greenthallium Phil. Mag., Jan. 1898. 2 B 2 352 Prof. A. A. Michelson on and 4. Those marked A referring to observations made withthe line of sight at right angles with the magnetic field andwith the plane of polarization perpendicular to the lines offorce ; while B correspond to observations with the line ofsight still normal to the field, but plane of polarizationparallel with the lines of force. Fig. 2.—Type It was found that there was no appreciable differencebetween these last and the observations taken when the lineof sight was parallel with the field ; but in this case it waspossible to analyse either one of the outer groups separatelyby the use of the quarter-wave plate, Q, fig. 1. This wasdone in a few cases, but no new result was obtained. The abscissae of the visibility-curves are differences of pathin millimetres, reduced to a field-strength of 10,000 asdetermined by a bismuth spiral. Radiation in a Magnetic 3.—Type II. 353
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
