| Description | Mints and Mint Engines (12 items).
YV: 40 horse power crank engine, with 6 foot stroke, [parallel motion, cast iron beam, cast iron connecting rod].
YW: 20 horse power independent engine, with 3 foot stroke, [parallel motion, cast iron beam, cast iron connecting rod].
Partially coloured reverse plan of the 40 horse engine house, transverse sections of the 40 horse engine, plan of the tunnel; plan of the boilers (the edge of the 20 horse engine house is marked on), longitudinal section of boiler - partially coloured original and reverse drawings; transverse section of boilers - partially coloured reverse drawing; connecting rod, crank shaft and fly wheel of 40 horse engine - partially coloured original drawing; 40 horse engine packing stage - partially coloured original and partially coloured reverse drawing; memorandum about a new engine and vacuum pumps (not dated). All the drawings except the last item bear letter codes.
Original Portfolio or 'Book' No. 1093 [?].
For the Bombay Mint. The 40 horse engine powered a new rolling mill - note that the drawings of boilers for a 40 horse engine in 1873 [see Portfolio 5/708a] may have been for this engine. These engines were omitted from the Catalogue of Old Engines. The Bombay Mint was expanded in 1860 and again in 1863.
See also: Portfolio 6/13 (air pump and condenser for the 40 horse engine).
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