| Description | Engine Designs by James Watt, Edward Bull and Jonathan Hornblower’s Engines, Dutch Windmill etc. (20 items).
1339b. Jonathan Hornblower's Engines, Radstock Colliery and Tincroft Mine. May 1792, Feb. 1800, Jul. 1813. 20 items.
Compound engines designed by Jonathan Hornblower.
Radstock Colliery engine:
General drawing of the engine marked "Plan of Radstoke Engine given by one of Hornbl. to Mr. Marttin [?] & by him to Wm. Murdock".
Section of the cylinders and end of the beam marked "Sketch of an Engine erected by the Messrs. Hornblowers at Radstoke."
Section and front view of the cylinders, plan of the tops of the cylinders and eduction pipe - shaded drawings.
General sections of the engine, section and front view of the cylinders, plans of the tops of the cylinders and eduction pipe - 4 sheets of reverse drawings.
Sketch plan of the cylinders, side view of the cylinders and view of the small cylinder - 2 small sketches (the side views are marked "Radstoke J. S." [John Southern]).
Sketch side view of the cylinders - unmarked.
Tincroft engine:
Sections and plans of the Tincroft engine by William Murdock and Simon Vivian, May 1792.
General drawings of Hornblower engines (probably based on the Radstock engine):
General section of a Hornblower engine - 2 coloured copies and reverse copy marked "Sketch to shew the Construction & Working of Hornblower's engine" - section with dimensions added in.
Sketch of the cylinders, condenser, valves etc. marked "Copy of Mr. Rennie's rough sketch of Hornblower's engine" - copy made 5 Feb. 1800 from an original made by John Rennie dated Truro, 3 Sep. 1799, with a copy of Rennie's description of Hornblower's engine dated Jul. 1799.
Elevation and plan of cylinders, pumps, cistern etc. of a Hornblower engine [?] - coloured drawing and reverse copy.
"Hornblower Engine at Willey":
"Plan and Sections of Condenser for the Hornblower Engine at Willey" - not dated, marked "The holes and thickness to be as directed for Wilson House Engine."
Engines built by Jonathan Hornblower for Radstock Colliery, Somerset, and Tincroft Mine, Cornwall. Hornblower had begun experimenting with compound engines independently of James Watt in the late 1770s, and he took out a patent in 1781. The Radstock engine was erected around this time. It had cylinders of 19 and 24 inches diameter and strokes of six and eight feet. The Tincroft engine was erected in 1791. For Rennie's letters concerning his visit to the engine in Sep. 1799 see 3/301, Correspondence & Papers, Letters from Rennie, 1799.
Published references: Dickinson & Jenkins p. 310, plate XCVII - general drawing of Radstock engine. |