| Description | Mints and Mint Engines (18 items).
12 horse power sun & planet engine, with 19 inch cylinder, 4 foot stroke, parallel motion.
Also cutting out machinery, drawings for the mint etc.
Mint & machinery drawings: reverse drawings of cutting out machinery, by John Southern, 15 Mar. 1798; coloured external elevation and cross-section of proposed new mint building by William Hollins, circa Apr. 1798; plan and cross-section of proposed new mint building by John Southern showing bays for coining presses, 14 May 1798; small sheet of drawings of parts [for vacuum pumps?] by John Southern, 22 May 1798; plan of part of cutting out machinery (not dated); drawing of ? (not dated).
Engine drawings: Reverse plan and section of the engine house and framing, sections of the framing and drawings of the cistern, cross-section and plan of the boiler house and boiler; 2 sheets of drawings of pipes, vacuum pumps etc. dated 1 Sep. 1798; draft [?] plan and section of the engine showing vacuum pump and pipe marked "direct"; coloured original and reverse general view and plan of the engine and boiler; "present working gear of the New Mint Engine" - side view, Apr. 1799; "alteration of the working gear" - partially coloured original and reverse front and side views, Apr. 1799 (the reverse copy includes a drawing of the bracket). Some of the engine drawings bear letter codes.
Also untitled and undated general view and plan of a 24 horse [?] sun & planet engine with 26 inch cylinder and boiler (this drawing has a note about drawings for John Cartwright on the back which has been partially erased).
Original Portfolio or 'Book' No. 307. Catalogue of Old Engines p. 164.
For Matthew Boulton, Soho Mint. This engine was often referred to as the "New Mint Engine" or "Mint Engine No. 2", and was installed during the major re-organisation of the mint in 1798. This engine replaced the original 8 horse mint engine [see Portfolio 5/714a] and was itself dismantled during the re-organisation of the mint in 1825-1826 and replaced by a 10 horse engine [see Portfolio 5/714e]. It was sold in 1831.
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