A discourse on the invention and improvements of the reflecting telescope. Delivered at the anniversary meeting of the Royal Society, November 30, 1777. / By Sir John Pringle, Baronet, President. Published at their request.

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A discourse on the invention and improvements of the reflecting telescope. Delivered at the anniversary meeting of the Royal Society, November 30, 1777. / By Sir John Pringle, Baronet, President. Published at their request. Public Domain Mark. Source: Wellcome Collection.