| Description | Vacuum and Blowing Engines (51 items).
Twelve horizontal engines (six pairs of two), with 40 inch cylinders, 8 foot strokes. Engines never completed.
"Sketch of Horizontal engines as proposed for South Devon Railway" - reverse plan and elevation, Aug. 1846; transverse sections of engine house - coloured reverse drawing, Oct. 1846; plan of engine house - tracing, not dated; plan and longitudinal section of engine house - tracing, Oct. 1846.
Set of tracings (not dated but with letter codes): plan and longitudinal section of engine house; transverse sections of engine house; plan of boiler house; longitudinal and transverse sections of boiler house.
Drawings May 1848: plan, longitudinal section and 2 cross-sections of engine house and engines (4 drawings on 1 sheet); cross-section (copied from the previous sheet).
Cylinder, slide valve etc.; air pump, condenser, waste water pipes etc., connecting rod and cross bar, guide frame, air pump arm etc., crank shaft and fly wheel and plummer blocks - partially coloured original and partially coloured reverse drawings; sketches of crank and shaft, sketch of connecting rod; cylinder and steam case - partially coloured reverse drawing; details of connecting rod and cross bar etc. (on tracing paper); proposed plan of sleeper plates showing cylinder, vacuum pump etc. - coloured original, coloured reverse copy, later uncoded drawing; plan and sections of vacuum pump; revised plan and elevation of the sleeper plates showing cylinder, vacuum pump, fly wheel etc. - coloured original drawing; plan of the sleeper plates only - coloured original and reverse drawings; working gear (eccentric circle, rod etc.) - partially coloured original and reverse drawings; plan showing the connection of engine and boiler houses - tracing and reverse copy; expansion gearing - partially coloured original and reverse drawings; cylindrical slide valve - coloured original and coloured reverse drawing; screw stop pipe - partially coloured original and reverse drawings; governor gearing - coloured original drawing. Most of these drawings bear letter codes.
Also the following rough and uncoded sketches etc: connecting rod and links, plate [?], injection gear, plate and plummer blocks for the expansion gearing (with reverse copy), shafts and rods, piston rod nuts, fly wheel segment coupling pin, air pump rod. Several of these small drawings are by Robert Meiklejohn.
Original Portfolio or 'Book' No. 984. Catalogue of Old Engines p. 272.
For the South Devon Railway. Engines and vacuum pumps for atmospheric railway. This was the second batch of engines ordered for the South Devon Railway. The first pair of this order (GC and GD) was intended for Totnes and the second pair (GE and GF) was for the Torquay branch. However the railway abandoned atmospheric working and the engines were countermanded before any were completed.
See also: Portfolio 6/45 (cylinder, steam case and slide valve).
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