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>XXI. Researches in circular solar spectra, applied to test residuary aberration in microscopes and telescopes, and the construction of a compensating eyepiece, being a sequel to the paper on a searcher for aplanatic images
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XXI. Researches in circular solar spectra, applied to test residuary aberration in microscopes and telescopes, and the construction of a compensating eyepiece, being a sequel to the paper on a searcher for aplanatic images