| Description | 80a. Screw Collier Co. Steam Boats Black Prince (CB & CC) and Firefly (CD & CE). Sep. 1853-Mar. 1854, Aug. 1854. 58 items.
Two sets of two 35 horse power direct engines, with 34 inch cylinders, 22 foot strokes.
Tracings sent by Thomas Vernon & Son:
Plan and sections; sections of 3 frames in the engine room, plans and sections showing engine keelsons, boiler platform etc. - partially coloured tracings; sketch of the plan of the engine room; midship section.
Sections, plans etc.:
Sections and plan of the engine and boiler sleepers - coloured drawing; cross-sections at frames 26 and 42, longitudinal section and plan of the engine room and boiler and shaft - large sheet of coloured tracings; cross-section showing the engines - partially coloured original and partially coloured reverse drawing. These drawings were made in the London office.
Components etc.:
Diagram of motion of slide valve; cylinder and slide valve, slide valve - coloured original and coloured direct copy drawings; plan and sections of the boiler - partially coloured reverse drawing marked "Not adopted"; plan of the engines, section of condenser and air pump, air and feed and bilge pumps - coloured originals and coloured direct copy drawings; section of the condenser, section of the hot water cistern - partially coloured originals and partially coloured direct copy drawings; section through the propeller crank pin, - coloured original and coloured direct copy drawing; air pump beam and cylinder cross bar - coloured drawing; sketch of eccentrics; connecting rod and straps - partially coloured drawing; eccentric circle and link - partially coloured original and coloured direct copy; eccentric gearing - coloured original and coloured direct copy drawing; engine shaft; foot and delivering valves - 2 coloured drawings; engine sleepers - partially coloured drawing; side view of cylinders and slide valves, plan of the top of the cylinders and air pumps etc. - original and direct copy drawings; screw shafting - coloured drawing; throttle valve etc. - partially coloured drawing; engine room telegraph - coloured original and coloured reverse drawings. All these drawings were made in the London office. The direct copies were sent to Soho, where some were given letter codes.
Miscellaneous drawings, memoranda etc.:
Specification of the engines; eccentric gearing, injection and throttle valve gear, brackets for wheels and telegraph dial plate - partially coloured drawings; connecting rods, parts of shafts etc. - 4 drawings; diagram of "link at its highest"; diagram of ?; note on the surface of the boiler; sketches of engines of the John Bowes, Sep. 1852.
Original Portfolio or 'Book' No. 1030.
For the General Iron Screw Collier Co. The Black Prince and Firefly were built by Thomas Vernon & Son of Liverpool. Note that Boulton Watt & Co. had previously supplied engines for a Dover packet boat also called Firefly [see Portfolio 6/31a)]. |