| Description | Mints and Mint Engines (10 items).
20 horse power crank engine, with 23¾ inch cylinder, 5 foot stroke, parallel motion, cast iron beam, cast iron connecting rod.
Partially coloured duplicate and reverse plan of the engine and boiler houses and vacuum pumps etc., longitudinal section of the engine and boiler, longitudinal view of the vacuum pump room and cross-section of the engine house and vacuum pump room, cross-section of the engine house and vacuum pump and coining rooms etc., cross-sections of the boilers for this engine and 40 horse engine. All the drawings bear letter codes.
Original Portfolio or 'Book' No. 741. Catalogue of Old Engines p. 160.
For the Calcutta Mint. This engine worked vacuum pumps for the vacuum-operated coining machinery. The engine was actually made in 1815, but not appropriated to the Calcutta Mint until 1821.
See also: 4/94 (Engine Order Book No. 8), Incoming Correspondence.
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