[Letters (8)] 1809 Nov-1812 Jun, Buckingham Street, Fitzroy Square [to] Thomas Farmer, Kennington Common / Wm.H. Wollaston. [14p. on 8 leaves, holograph signed. MS. 1190/1-3 (to 1810 Feb 14) concern manufacture of a platinum boiler for sulphuric acid; MS 1190/4 (of 1811 Jan 29) concerns repairs to it; MS 1190/5-8 (of 1812) deal with further repairs and manufacture of a second boiler? Some items bear rough notes and pencil sketches by Farmer and/or Wollaston. See also inv. nos. 1992-285 (MS 1190/9) and 1993-424 (MS 405)]