| Title | Bombay Mint, India, general, cutting out and coining, rolling mill engines, 1823, 1824, 1846, 1860, 1869, 1871, 1873 |
| Description | Mints and Mint Engines (28 items).
EC: 10 horse power independent crank engine, with 19¾ inch cylinder, 2½ foot stroke, parallel motion, cast iron beam, cast iron connecting rod.
VB: 24 horse power crank engine, with 26 inch cylinder, 5 foot stroke, parallel motion, [cast iron beam, cast iron connecting rod].
VS: 40 horse power crank engine, with 32½ inch cylinder, 6 foot stroke, parallel motion, [cast iron beam, cast iron connecting rod].
Partially coloured reverse plan of the 40 and 10 horse engine houses and boilers, cross-sections of the 40 horse engine house and longitudinal section of boiler, longitudinal section of 10 horse engine house and cross-section of boilers, longitudinal section of 40 horse engine house and cross-section of 10 horse engine house (marked "See corrected drawing LXM" [in Portfolio 5/708b below]), longitudinal section of 24 horse engine and boiler houses, plan of the 24 horse engine and boiler houses and exhausting pumps and shaking apartment etc., cross-section of 24 horse engine house and exhausting pumps and shaking apartment, sections of 24 horse engine and boiler houses and pump room, plans of the engine tunnels.
Also plan and section of the 10 horse slide valves and casing, Jul. 1846; reverse longitudinal section of foundations for compressed air pumps, transverse section of 24 horse engine house showing addition to foundations for crank shaft of compressed air pumps, Aug. 1860; plan and sections of boiler, Jan. 1869; tracing of plan of 24 horse boiler house, Jan. 1871.
Also drawings for new boilers, May 1873: plan, longitudinal and transverse sections of boilers for 24 horse engine - coloured direct and coloured reverse drawings; steam and feed pipes for 24 horse engine boilers - tracings; plans and sections of boilers for 10 and 40 horse power engines - coloured direct and coloured reverse drawings, draft pencil elevations; 2 sheets of drawings of brackets [?]. [Note that the 40 horse engine mentioned on these drawings may be the later 40 horse ordered in 1860 - see Portfolio 5/708c below.] All the drawings bear letter codes.
Original Portfolio or 'Book' No. 770. Catalogue of Old Engines p. 160.
For the Bombay Mint. The 10 horse engine, which was actually made in 1816, drove general machinery and triturating apparatus, the 24 horse engine powered the cutting out machinery and powered the vacuum pumps for operating the coining presses, and the 40 horse engine drove the rolling mill. The Bombay Mint used some of the machinery from the old Soho Mint [see Portfolio 5/714]. The mint was expanded in 1860 and again in 1863.
See also: 4/95 (Engine Order Book No. 9 - Engine EC).
Incoming Correspondence.
Portofolios 6/13, 7/8 (later mint machinery etc.).
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