Blackwell, Mrs A. (fl. 1811–1820), of Seymour Place, London

(See O.13.19, No. 112, and O.13.20, No. 3. The London and County Directory of 1811 lists a Mrs Blackwell at 6 Seymour Place, Mayfair. She may have been connected with the engraver Charles Theodosius Heath, who later lived at the same address. Mrs Blackwell wrote to Dawson Turner in 1820 in connection with George Graham Blackwell (d. 1838), then at Oxford, who paid a visit to the Turners during the long vacation of that year.)