Weekly Advertiser Sunday 22nd October 1865
Amateur astronomers of Great Britain and Ireland are invited to send to the President of the Royal Astronomical Society, Somerset House, a short account of their means of observation : for example, the nature of the instruments they possess stating (in the case of telescopes) whether they are refractors or reflectors, their aperture, focal length, and form of mounting; also, whether the instruments are placed in observatories or used in the open air.
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