Two letters from Cuthbertson, 18 May 1814 and 12 June 1814 concerning problems that Dalton was experiencing using an "electrical machine" (battery) and glass jars, which Cuthbertson had made. In the second letter, Cuthbertson sets out in detail how problems could be avoided, noting the distorting effects of thick glass [John Cuthbertson was a well-known scientific instrument maker, noted for manufacturing electrostatic generators.]
Dated at: London