Dr Ferguson of Fergus Ontario stated that at 4.00 am on the 28th March 1893, he found that Antares and its green companion so easily divided by his 3.5 inch Cooke that he tried smaller apertures and was always successful in “clearly and distinctly” separating them until he reaches 2.5 inches, when “the green star was visible as a thickening of the diffraction ring.
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