An operator treating Ann Ford, a society lady, with "Perkins's tractors", for her venomous tongue. Coloured etching by C. Williams, 1802.

[London] (50 Piccadilly) : S.W. Fores, 16 September 1802.

1 print : etching, with watercolour

The tractors. A new discovered virtue in these invaluable operators most cordially recommeded to the public at large and to Dr. Perkins in in [sic] particular as a likely means of preventing more murder than all the poenal statues. CW esqr. delt.

British Museum, Catalogue of political and personal satires, vol. VIII, no. 9926

Wellcome Collection 11821i