extract from a letter of the Rev. Mr. John Hellins, formerly assistant to Mr. (now Dr.) Maskelyne, the Astronomer-Royal at Greenwich Observatory, to Francis Maseres, Esq. Dated Potter's Pury, near Stoney Stratford, in Buckinghamshire, Sept. 25, 1792.
Series: Eighteenth Century -- reel 11023, no. 06.
Published: 1792
Place of publication: [London