| Description | Engine Designs by James Watt, Edward Bull and Jonathan Hornblower’s Engines, Dutch Windmill etc. (18 items).
1343. Self-Moving Rotative Motions (i.e. engines). Sep. 1782, Feb., May 1783. 18 items.
Rotative and semi-rotative engines, chain and bucket engine.
Rotative engines:
Set of numbered drawings: No. 1 - Cross-section of the Cylinders and Axle; No. 2 - Lengthway section of the Clack door; No. 3 - Upright section of the Clack door; No. 4 - Outside end view of the Cylinder and Axis; No. 5 - Lengthway section of both Cylinders and Axis; No. 6 - Outside view of the cylinder - 6 drawings on 1 sheet (not dated); 8 plans and sections of rotative engines - these drawings are marked as being invented by James Watt and drawn by John Southern, but otherwise untitled, Sep. 1782; "Self-Rotative Engine" invented by James Watt and drawn by John Southern, Feb. 1783; 5 untitled drawings of rotative engines. These drawings show more advanced designs of the "New Rotative Engine" described by Watt in his patent of 1782.)
New Reciprocating Semi-Rotative Engine:
Section and side view of the engine and outside front view of the engine - 3 drawings on 1 sheet (these drawings are almost identical to those in the patent of 1782); small drawing of part of semi-rotative engine (not marked).
Chain and Bucket Engine:
Side and front views of the engine and views of a bucket - sheet of reverse drawings by John Southern, May 1783.
Original Portfolio or 'Book' No. 27. Catalogue of Old Engines p. 338.
John Southern opened Book No. 27 in 1782 and divided it into two parts, noting in his List of Books that the first part contained drawings for "Self-moving rotative Motions etc." and the second part, numbered as 272, contained drawings of "Equalizing Beams, Rotative Motions." In the two parts were placed drawings for the various designs and schemes that Watt was working on or had worked in the previous year, particularly in connection with his patents. They contained drawings of designs for rotative engines which appear to be more advanced than the type described in the 1782 patent, the "reciprocating semi-rotative engine" described in the 1782 patent, the various types of equalizing machinery developed by Watt for expansive working and used on engines at Soho and also described in the 1782 patent, drawings of the various types of rotative motion described in the 1781 patent, a "chain and bucket engine", various drawings of valves, working gear etc, and drawings of the experimental "double expansive" compound engine erected at Soho, whose construction and operation was included in the 1782 patent.
Henry Hazleton numbered the first part of Book 27 as Portfolio 1343 and the second part as Portfolio 1341. |