| Description | Steam Boat Engines (111 items).
1235. H. M. Frigate Centaur (JL & JM). May-Jul., Nov. 1844, Jan.-May, Jul., Aug.-Oct. 1845, Mar., Apr., Jul., Sep.-Dec. 1846. 111 items.
Two 270 horse power direct-acting "Gorgon"-type boat engines, with 85½ inch cylinders, 6 foot strokes.
Cross-section of the boat and engine room, longitudinal section of the engine room and boiler - original and reverse drawings; plan of the engine and boiler sleepers, plan of the engine deck beams - reverse drawings.
Plans and sections of tubular boiler - partially coloured drawing; cylinder - partially shaded original and partially shaded reverse drawings; cylinder lid and bottom - partially shaded reverse drawing; upper nozzle, lower nozzle, outside view and section of lower nozzle - partially coloured original and partially coloured reverse drawings; plans and sections of tubular boiler - partially coloured drawing; sections and plans of condenser, end view of condenser and cistern, air pump, air pump bucket - partially coloured original and partially coloured reverse drawings; side view of hot water cistern - original and reverse drawings; foot and delivery valves - coloured original and coloured reverse drawings; air pump beam and connecting rod - coloured reverse drawing marked "See altered drawing OLI" and coloured reverse drawing OLI; headstock frame - partially coloured original, partially coloured direct copy and partially coloured reverse drawings; shaft and cranks - original and direct copy; paddle wheel etc. - partially coloured original, partially coloured direct copy and partially coloured reverse drawings; section and plan of feed, brine and blow off pipes, section at forefront of boiler showing feed and blow out pipes - partially coloured original and coloured reverse drawings; plan and section of refrigerator - partially coloured drawing; hot water pump - partially coloured direct copy and partially coloured reverse drawings; hot water pump etc. - original and reverse drawings; brine and bilge pumps - partially coloured original, partially coloured direct copy and partially coloured reverse drawings; air, brine and bilge pumps - original and reverse drawing; cylinder cross bar - partially coloured original, partially coloured direct copy and partially coloured reverse drawings; connecting rod - partially coloured original and partially coloured reverse drawings; expansion grades - original and direct copy; eccentric, working gear shaft etc., starting apparatus, eccentric circle and rod etc., plan of working gear shaft etc., plan of working gear and balance weight shafts, injection pipes, disengaging apparatus (drawings marked "Not adopted") - partially coloured original and partially coloured reverse drawings; steam stop valves - original and reverse drawings; disengaging apparatus - partially coloured direct copy and partially coloured reverse drawings; coal boxes - partially coloured original and partially coloured "right" copy; piston with metallic packing, brine and bilge delivery pipes - partially coloured original and partially coloured reverse drawings; waste, feed and small engine pipes - original and reverse drawings; additional feed discharge valve - reverse drawing; new valve springs - partially coloured original and reverse drawings; hand pump to be worked by little engine - "right" copy and tracing; new crank shaft for small engine to work additional hand pump - original, direct copy and "right copy" drawings; air pump beam - partially shaded original and partially shaded reverse drawings; vacuum pump for slide valve balance weight - reverse drawing marked "not adopted" (not coded, date erased). Most of these drawings were made in the London office and almost all bear letter codes.
Also the following rough sketches, memoranda etc.: printed list of tools and spare articles (originally made out for 650 horse engines; note that this gives the cylinder diameter as 80 inches); memorandum re hold down bolts; sketch of the air pump beam showing proposed additional plate; sketch of steam pipes; sketch of connecting rod with shortened dimensions; small sketch of blow valve handles; tracing of loaded valve as altered; conical pipes; 2 drawings of connecting rod; list of drawings.
Original Portfolio or 'Book' No. 952. Catalogue of Old Engines p. 322.
For H. M. Navy. Centaur was a 22 gun frigate built by Symonds. She was broken up in 1864.
See also: Portfolio 6/23. |