What similar phenomenon.' he says:-" if, from a rapid rail-

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By j aitken · 1879 · cited by 22 — another and distinct kind of ocular spectrum, which we may call a motion spectrum. it is seen when we look firstat a body in motion and afterwards direct ...

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ONANEWVARIETYOFOCULARSPECTRUM.ByJOHNAiTKEN.IFwelookforashorttimeatanyobject,andafterwardsturntheeyeinanotherdirection,weseeaspectralimageoftheformoftheobjectfirstlookedat.Again,ifafterwehavelookedatanycolouredobjectweturntheeyeinanotherdirection,weseeaspectralimageofacolourcomplementarytothatfirstlookedat.Inadditiontothesespectralformsandcolours,Ifindthereisanotheranddistinctkindofocularspectrum,whichwemaycallamotionspectrum.Itisseenwhenwelookfirstatabodyinmotionandafterwardsdirecttheeyetowardsanobjectatrest.Theobjectatrest,whenseenundertheseconditions,seemstobeinmotion,andthedirectionofitsapparentmotionistheoppositeofthatofthemovingbodyfirstlookedat.Ifirstobservedthismotionspectrumwhenlookingatthesurfaceofariverwhereitwasflowingrapidly,theeyebeingafterwardsdirectedtoagravelbank.Thefirsteffectseemedtobeanindistinctnessofvision,but,oncarefullyrepeatingtheexperiment,Iwasmuchastonishedtoobservethat,afterlookingsteadilyatthestreamandthenatthegravelbank,anarrowspectralstreamofgravelseemedto...

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