| Description | Mints and Mint Engines (8 items).
Plans of the Extension, 1791:
Draft plan of the mint and extensions, circa 1790-1791; partially coloured plan and elevation of the mint and proposed extensions by John Southern, circa 1791; plan of the mint and proposed extensions showing existing garden buildings etc., circa 1791 - original and reverse drawings.
Miscellaneous Items:
Press copy sketch of pipes [?], 26 Jun. 1795; press copy sketch of valve [for vacuum pipes?]; sheet of notes, calculations and sketches by John Southern, Mar. 1796, including calculations of pumps, work that that an 8 horse engine will do, pencil sketch of engine and vacuum pipes etc.; press copy sketch of the boiler fireplace, Apr. 1796.
For Matthew Boulton, Soho Mint. It is unclear which Book these drawings were originally kept in.
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