A digitised scan of the Analytical Institutions is available at Google Books. Hellins signs the Editor's Advertisement 29 September 1801, Potter's-Pury.
. An early scientific paper was: "Theorems for Computing Logarithms." By the Rev. John Hellins; Communicated by the Rev. Nevil Maskelyne, D. D., F. R. S. and Astronomer Royal,in Philosophical Transactions Series I,(1780), volume 70, pages 307–317 [Referred to by Smithsonian/NASA ADS Astronomy Abstract Service.