| Description | Steam Boat Engines (36 items).
1234. H. M. Frigate Hydra (NN & NO). Jul. 1834, Mar., Jun., Jul. 1835, Jan., Mar. 1836, Aug., Oct.-Dec. 1838, Jan., Feb. 1839. 36 items.
Two 110 horse power side lever boat engines.
Section of the boat and engines showing guns and gun deck - reverse drawing; set of partially coloured reverse drawings: 1 - plan of the engine sleepers; 2 - plan of lower platform (not coloured); 3 - longitudinal section of engine room and boiler; 4 - cross-section of boat and engines; 5 - plan of engine room deck beams; 6 - plan of engine room upper deck beams; 7 - cross-section of boat at aft end of boiler; 8 - cross-section of boat at Station 12 showing front of boiler. These drawings were made in the London office.
Section and plan of boiler, cross-section of front of boiler - partially coloured original and partially coloured reverse drawings made in the London office; longitudinal section of boiler - partially coloured original and partially coloured reverse drawings; steam and feed pipes - partially coloured original and reverse drawings; emptying pipes and cocks - original and reverse drawings; feed pipes - partially coloured original and reverse drawings; coal boxes - reverse drawing made in the London office (marked "altered to serve Danube No. 9" [Metternich]); 2 small rough sketches of cranks. All these drawings except the last 2 items bear letter codes.
Also the following later items: sketch for lower discharge valve - partially coloured original and partially coloured reverse drawings, Aug. 1838; coal boxes - coloured reverse drawing and tracing, sketch for alteration of eccentric rod - original and reverse drawings, Oct. 1838; diagrams of the operations of the crank, Nov. 1838; transcript of memorandum by James Brown of experiments made with the engines, 31 Dec. 1838, 22 Jan. 1839; cross-section of boat and engines, section of fore bulkhead, longitudinal section of engine room and plan of deck beams, plan of upper platform and coal boxes - partially coloured reverse drawings made in the London office, Feb. 1839.
Original Portfolio or 'Book' No. 894. Catalogue of Old Engines p. 320.
For H. M. Navy. The engines were ordered in 1834, but the boat did not come out of dock until 1838. She was initially referred to as a steam frigate, but the 1839 drawings describe her simply as a steamer. She was broken up in 1870. |