1To Benjamin Franklin from Aaron Burr, 20 March 1753 (Franklin Papers)
Letterbook copy: Andover-Newton Theological Seminary Your Febry. 28. with the enclos’d Letters was very acceptable. I am sorry we [are] not provid’d with Instruments to observe the approaching Transit of Mercury. But have long since been determined to be ready for Venus 1769. By Mr. Evans’s Advice I wrote to one Mr. Adams’s in London sending a Catalogue of Instruments for a philosophical...