| Description | Mints and Mint Engines (18 items).
11 horse power sun & planet engine, with 18 inch cylinder, 4 foot stroke, parallel motion.
Also lapping mill and cutting out presses.
Undated general plan and section of the lapping mill showing the engine in situ.
Drawings Jun. & Jul. 1788: Working gear - reverse front and side views; plan of the engine house and boiler - 2 reverse copies, one marked "Copy of an original sent to Mr. Rennie the 5 Jul."; sections of boiler.
Reverse drawings, 29 Jul. 1788: general view of the engine, plan of the engine and boiler, front view of the framing and cross-section of the boiler, longitudinal section of the boiler and seating.
Drawings Nov. & Dec. 1788: plan and section of the cutting out presses - reverse drawing; top piece of the cutting out presses - original and reverse drawings; governor - reverse drawing; connection of governor to throttle valve.
Also cross-section, plan and press copy longitudinal section of boiler, Jul. 1790; undated sketch of beam. All the drawings from Nov. 1788 onwards bear letter codes.
Original Portfolio or 'Book' No. 108. Catalogue of Old Engines p. 164.
For Matthew Boulton, Soho Manufactory. This engine powered the lapping machinery in Boulton's rolling mill, and also cutting out presses for producing copper blanks for the Soho Mint coining presses. This engine survives in the Science Museum, London.
Published references: Dickinson & Jenkins, p. 221, plate LXXX - governor.
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