| Description | Components and Parts of Boat Engines and Boat Engines for Land. (4 items).
1430. Spur Wheels. 1817, 1820, 1827. 4 items.
Spur wheels for 20 horse boat engine - press copy sketch, Dec. 1817 [stuck to the same sheet is a press copy sketch plan of the air pump and condenser].
Sketch of wheels for 40 horse boat engines, May 1820.
[Used for engine XS, Lightning.]
Spur wheels for 40 horse boat engine - shaded drawing, May 1820.
Spur wheels for J. B. Humphreys, Post Office steam boats - coloured drawing, May 1827 [copied from reverse drawings of 1816 and 1818]. |