[Invoice] 1809 Dec / [W.H. Wollaston, for a platinum boiler supplied to Thomas Farmer for manufacture of sulphuric acid. 1 leaf, holograph. Gives detailed costs, including those for "Syphon" to lead off the acid. Total cost is £301 9s 3d. Endorsed with note of payment on [1810] Feb 16. See also inv. nos. 1992-284 (MS 1190/1-8) and 1993-424 (MS 405)]