498 SEC. 12. APPLIED MECHANICS. 



2149. Model of a Direct-acting Marine Steam Engine. 



Patented by J. Miller, A.D. 1841, No. 9,107. 



H.M. Commissioners of Patents. 



2153a. Whole Model of an Iron Floating Dock, built 

 for the French Government by Messrs. Randolph, Elder, and Co., 

 Glasgow, for Port Saigon, Cochin China. John Elder and Co. 



Dimensions of the dock: Length 300 feet, breadth 94 feet, depth 42 feet. 

 Weight of dock, 2,800 tons. 



The dock will lift a ship of 4,800 tons weight, drawing 27 feet of water. 



2153b. Three Drawings of Compound Marine Engines, 

 constructed and fitted on board H.M.S. " Constance" in 1863, by 

 Messrs. Randolph, Elder, and Co., Glasgow. John Elder and Co. 



They were the first compound engines fitted in any of H. M. ships, and have 

 two 60 inch cylinders, four 78 inch cylinders, of a stroke of 3 feet 3 inches, 

 and are fitted with surface condensers. 



No. 1, Plan, looking forward. 



No. 2, Cross sectional elevation, looking forward. 



No. 3, Cross sectional elevation, looking astern. 



2153c. Model of Lifeboat Bridge and Lifeboat, as 



fitted on board H.M.S. "Orontes" and "Tamar," showing the 

 method of carrying and launching ships' life-boats transversely. 



John White. 



This is a working model of Mr. J. White's plan, adopted by the Admi- 

 ralty for H.M. ships of war and Indian relief troop ships, for carrying and 

 launching life-boats from ships' upper deck. 



2154. Model of Dawes and Holt's Marine Engine. 



Henry P. Holt, C.E. 



This is of the vertical compound condensing type, without intermediate 

 receiver between high and low pressure cylinders, and very short passages, 

 reverse action of pistons, parallel motion, single crank and connecting rod, 

 one vertical and one horizontal air pump, the former forming a counterbalance 

 to connecting rod, and the latter is arranged to be used as a starting cylinder 

 when required. 



2168b. Wave-Indicator. An instrument intended for the 

 direct tracing of the height of the waves, and for deducing their 

 form. Vice- Admiral Paris, Paris. 



2168c. Rolling-Indicator. An instrument indicating the 

 rolling of ships, not only at its extreme amplitude, but during all 

 its periods. Vice- Admiral Paris, Paris. 



These two instruments are due to the late Lieutenant Armand Paris, son of 

 the Admiral. 



2169. Set of (eight) Models of the Block-making 

 Machinery invented by Sir Isainbard Brunei, for the use of 



