Abstract
COLOUR-ABERRATION OF REFRACTING TELESCOPES.—At a recent meeting before the Royal Astronomical Society, the proceedings of which will be found in the Observatory (No. 208, December), Mr. H. Dennis Taylor read an abstract of a paper entitled “The Secondary Colour-Aberration of Refracting Telescopes in Relation to Vision,” which had for its aim the determination of the detriment to vision, if any, and the percentage of light lost for defining purposes, owing to the presence of the usual colour-aberrations. In the colour curves which the author exhibited, where the wave-lengths and longitudinal colour-aberrations were represented by the ordinates and abscissæ respectively, some remarkable facts were brought to light. A comparison with Captain Abney's curves of the luminous intensity of the normal solar spectrum gave a means of obtaining a rough estimate of the percentage of light thus lost. The following table gives one a rough idea of these losses for different objectives in the case of star work, 100 representing the whole amount of light transmitted: —
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