| Description | Mints and Mint Engines (17 items).
Mint machinery etc. Machinery formerly belong to Soho New Mint, Soho Manufactory.
Fly wheel, 14 horse independent (marked "Sketched from that made for the 12 horse Lambeth W. W., to be used for Soho Mint"); regulating valve and gearing for the vacuum vessel - partially coloured reverse drawing marked "Sold to Ralph Heaton & Son, Birmingham, 3 Jul. 1850"; working gear for vacuum vessel - coloured reverse drawing; cast iron work for the coining press - partially coloured reverse drawing; apparatus for working the coining press - coloured reverse drawing; parts of coining apparatus - partially coloured reverse drawing; parts of laying on apparatus - partially coloured original and reverse drawings; vacuum cylinder and connecting pipe, vacuum vessel - partially coloured reverse drawings; details of gearing for working the coining press except the bell crank and bracket, gearing for working coining press except the balance weight, atmospheric valve and gearing, vacuum valve and gearing - reverse drawings; laying on apparatus, coining press - coloured reverse drawings; details of coining press - reverse drawing. All these drawings bear letter codes.
Catalogue of Old Engines p. 164.
For James Watt & Co., "Soho Mint", Soho Foundry. When the Soho Mint at the Soho Manufactory, then owned by M. P W. Boulton, was demolished in 1850, James Watt & Co. purchased one of coining presses and set it up at Soho Foundry. This sole press is referred to as "Soho Mint" on these drawings, but it is not clear if it was ever set to work. This press was later incorporated into the new mint established by James Watt & Co. in 1860.
See also: Portfolio 6/84a (regulating valve for the vacuum vessel).
Portfolio 7/36a (apparatus for working the coining press).
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