| Description | Mints and Mint Engines (39 items).
10 horse power independent crank engine, with 19¾ inch cylinder, 2½ foot stroke, parallel motion, cast iron beam, cast iron connecting rod.
Also mint machinery, lathe, plans of the coining room etc.
Plans:
"Plan of new Press Room at Soho" - partially coloured plan by Rickman & Hutchinson, Architects, 1825; rough drawings by William Creighton, Aug. 1825: plan of the mint, cross-section of the engine house and longitudinal section of the coining room, longitudinal section of the engine house and cross-section of the boiler house (with sketch of columns and balcony on the reverse).
Machinery etc.:
Bevil wheel patterns, 11 Sep. 1822; "Scheme for coining press frame etc.", 10 Apr. 1824 - coloured original plans and sections; drawings for new lathes, Apr.-Jun 1824 - screw and spindle, full size drawing of spindle (on the back is part of a coloured plan of the Bombay Mint), support for the lathe, section of lathe bed [?], pinion and method of disengaging [?], segment of screw wheel; disengaging gear for large lathe, Jun. 1825; support for shaking machines, Aug. 1825 - coloured drawing; tightening pulleys, Aug. 1825; support bracket for tightening pulleys, Dec. 1825; section of screw and wheel for lathe, Feb. 1826 - coloured drawing; upright shaft and foot block, Apr. 1826; plan of part of cutting out machinery marked "A Drawing made to shew that Curves 15 inches deep will not work with centre placed as below…", Apr. 1826, with draft version (on the back of this is a coloured drawing of tunnels for the Mexico City Mint); plan and section of annealing stove, Apr. 1826.
Also undated, rough and unidentified drawings including the following: sketch of upright shaft by William Creighton; pencil sections of wheels for coining presses [?]; sheet of coloured drawings of a lathe; sheet of drawings of shafts etc. for driving a lathe [?]; section and plan of pulleys; sheet of pencil drawings of pulleys, shafts, grindstone etc.; unidentified; 4 card templates of curves for cutting out machinery; pencil plan of curve; unidentified; part of a connecting rod [?].
Memoranda & Letters:
Letter from M. R. Boulton to Gilbert Hamilton dated Ramsgate, 21 Oct. 1824 with remarks on drawing of a bar lathe; "Soho Mint Apartments", 10 Aug. 1825 - list of the various rooms with dimensions and remarks; "Soho New Mint - Articles to be ordered from Drawing Office", 15 Aug. 1825; "Speeds of Lathes & Diameter of Driving Drums & Pulleys", 24 Nov. 1825 (in M. R. Boulton's hand).
Original Portfolio or 'Book' No. 810. Catalogue of Old Engines p. 164.
For Matthew Robinson Boulton, "Soho New Mint". The drawings for the engine were kept in a separate Book, No. 805. This and the Book of buildings and machinery drawings, No. 810, were given to Matthew Robinson Boulton on 13 Jan. 1836. Boulton does not appear to have had any copies made for the engine firm or returned any of the reverse drawings; therefore what remains is mainly rough drawings, sketches and drawings for machinery components. According to the Drawing Office Index, the main sets of drawings were given to Thomas Jones Wilkinson on 14 Jun. 1847.
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