IX. NAVAL ARCHITECTURE, ETC. 495 



2156. Model (working), on a 3 inch to 1 foot scale, of the 

 Condensing Vertical Screw Engines of steamship " A. 



Lopez," Cadiz and Havannah Spanish Mail Service. 



South Kensington Museum, 



The engines are constructed on the hammer or inverted cylinder principle, 

 and have condensers, air and feed pumps, variable expansion gear, &c. The 

 model is a complete working condensing engine of about 15 horse-power, 

 It was made in 1866-7, and exhibited in motion at the Paris Universal Exhi- 

 bition of 1867. W. Denny and Brothers, Engineers and Shipbuilders, 

 Dumbarton. 



The condensers of these engines are on Spencer's surface plan. They 

 comprise a large central box, on the top edges of which rest the cylinders. 

 The piston rods, two to each piston, work down by the sides of the con- 

 denser, and move in guides carried by the sides of the box. The pumps are 

 worked off the cross heads, which are suitably prolonged for the purpose. 



2158. Drawing, on a 1 inch to 1 foot scale, of the Com- 

 pound Inverted Cylinder Screw Engines of the steamships 

 " Edinburgh Castle " and " Windsor Castle," built and engined in 

 1872 by the donors of the drawing. It. Napier and Sons, Engi- 

 neers, Glasgow. South Kensington Museum. 



The engines are of 270 horse-power, nominal, having surface condensers, 

 air and feed pumps, link motion for reversing, &c. 



Diameter of high-pressure cylinder, 44 inches. 



Diameter of low-pressure cylinder, 72 inches. 



Stroke, 3 feet 6 inches. 



The steamships belong to Messrs. Donald Currie and Co.'s Colonial Line 

 of Mail Steamers, and run direct between London and the Cape of Good 

 Hope. 



2159. Model, on a scale of 1J inch to 1 foot, of the Oscilla- 

 ting Cylinder Condensing Engines of the Holyhead and 

 Kingstown Royal Irish Mail Faddle Steamer " Leinster." 



750 horse-power, nominal. Diameter of cylinders, 98 inches ; 

 stroke, 6 feet 6 inches. South Kensington Museum. 



To the engines are attached, on the same scale, the feathering float paddle- 

 wheels of the ship, which are 32 feet in diameter. The floats are 12 feet 

 long by 4 feet 10 inches deep. Ravenhill, Easton, & Co., Engineers, 

 Katcliff, London. 



The length of the " Leinster" is 350 feet over all. Beam, 35 feet; depth 

 of hold, 21 feet. Tons, 2,000. The ship has 8 boilers, 4 before and 4 abaft 

 the engines, having 40 furnaces fired in line with the keel. The draught of 

 the ship is 8 feet 6 inches on an even keel, and her speed about 21 statute 

 miles per hour. She was built by Messrs. Samuda Brothers, Poplar, in 1860. 



2153d. Model of H.M. Steam Troopship " Orontes," 



on a \ scale, showing the arrangement of three canting bridges 

 for lifeboats, with lifeboats built on Lamb and White's principle. 

 Also 10 of Captain J. W. Hurst's patent life-rafts, lashed to ship's 

 side. J. White, Cowes. South Kensington Museum. 



