| Description | Mints and Mint Engines (30 items).
E: 30 horse power crank engine, with 28? inch cylinder, 6 foot stroke, parallel motion, cast iron beam, cast iron connecting rod.
F: 16 horse power crank engine, with 21½ inch cylinder, 5 foot stroke, parallel motion, cast iron beam, cast iron connecting rod.
ZY: 10 horse power independent crank engine, with 19¾ inch cylinder, 2½ foot stroke, parallel motion, cast iron beam, cast iron connecting rod.
Engine houses:
Rolling mill engine house: Reverse plan of the engine and boiler houses (2 designs, the second has a small elevation on the same sheet), cross-section of the engine and boiler houses, sections of the engine house and plan of the underside of the beams ("A scheme for supporting an iron floor"), longitudinal section of the boiler and seating.
Cutting out engine house: Reverse plan of the engine and boiler houses, longitudinal section of the engine and boiler houses, sections of the engine house.
Coining engine house: Plan of the engine and boiler houses, longitudinal section of the engine house and cross-section of the boiler house, longitudinal section of the boiler, cross-section of the engine house and room behind it, longitudinal section of the room behind the coining engine house.
Cast iron entablature beams (for the rolling mill engine house?) - shaded original and reverse drawings (the original drawing has plummer blocks on the same sheet, while the reverse drawing has a section of the engine house above the entablature beam on the same sheet).
Engines and Boilers:
Cutting out engine: reverse plan of the engine and boiler, coloured original and reverse general view of the engine and boiler, longitudinal section of the boiler.
Rolling mill engine: reverse plan of the boiler foundations and cross-section of the boiler.
Coining engine: reverse general view of the engine and boiler, plan of the engine and boiler and "Room X" [pump room?].
Cartoon of the "New Mint Engine", 1807, showing the King on a horse on top of the engine beam [by William Creighton].
Also the following later items: Press copy plan and sections of boiler, Oct. 1813; undated press copy plan and section of flue etc.; plan and sections of second boiler for rolling mill engine, Jun. 1816; sketch plans and section of new boiler for coining engine, Sep. 1816; press copy sketch of governor, shafts etc. marked "Mr. Lawson for the Royal Mint, 1 Jan. 1817"; new nozzles, valves, etc. for rolling mill engine - partially coloured reverse drawing made in the London office, 6 Dec. 1839; new nozzles for cutting out engine marked "from 20 horse pattern altered" - partially coloured original and reverse drawings, Dec. 1839. All the engine house and engine drawings and some of the later drawings bear letter codes.
Original Portfolio or 'Book' No. 565. Catalogue of Old Engines p. 162.
For the British Mint, later the Royal Mint, Tower Hill, London.
See also: Incoming Correspondence.
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