420 SEC. 12. APPLIED MECHANICS. 



21471. Stem of a First-rate showing the disposition of the 

 frame and stern timbers. William Moody. 



2148. Model of the first steamer " Comet," built in 1811 

 by John Wood, senior partner of John Reid and Co., Port Glas- 

 gow, Henry Bell, engineer. 



John Reid and Co., Engineers and Shipbuilders, Port 

 Glasgotv. 



Dimensions, 40 feet x 10 feet 6 inches x 4 feet. Power of 3 horses. Plied 

 between Greenock and Glasgow. 



2148a. The Original Engine of Henry Bell's Steamboat 

 " Comet," which was the first steamboat in Europe advertised 

 for the conveyance of passengers and goods. 



Lent from the Patent Office Museum by the Commissioners 



of Patents. 

 The engine was made and fitted on board the " Comet " in 1812. 



2148b. Drawing of the " Elizabeth, 5 ' built by Charles 

 Baird in 1815, and run on the Neva. 



George Baird, St. Petersburg. 



She was constructed out of a barge, and the chimney was of brick. The 

 floats of the paddle-wheels were kept in a vertical position by means of 

 shafts and mitre wheels. Scale of drawing, ^ inch to the foot. 



2148c. Drawing of Paddle-wheel Steamer, built by 

 Charles Baird in 1817, to carry passengers between Petersburg 

 and Cronstadt, showing end view, longitudinal view, plan, and 

 longitudinal section. George Baird, St. Petersburg. 



A. Steam engine. 



B. Boiler. 



C. C. Crank shafts on either side, with fly-wheel. 



D. D. Toothed wheels driving paddle-wheels. 



E. E. Paddle-wheels with floats revolving 50 turns per minute, by which 

 the vessel is propelled. 



F. Funnel leading from furnace serving in place of a mast. 

 G. G. Fore and aft cabins. 

 H. H. Side decks, to protect the wheels from the blows of the waves. 



I. I. Paddle-boxes. 

 K. L. Staircase and rudder. 

 Scale of drawing, ^" to 1 foot. 



2148d. Model of Screw Propeller, driven by a pair of engines 

 direct acting, having sun and planet motion at crank, so as to give 

 the propeller two revolutions for every revolution of the engine. 



Glasgow Mechanics' Institution. 



2148e. Model of Iron Floating Dock, built by Messrs. 

 Randolph Elder and Co. (now John Elder and Co.), Glasgow, and 

 erected at Saigon, Cochin China, for the French Government. 



Messrs. John Elder and Co. 



