in. PRIME MOVERS. 457 



tappet valves (C and D) opening into it, removes the condensed water from 

 the upper chamber into the hot water' cistern, whence it flows away. 



The exhaust steam from engine enters at A, meets the injection water 

 entering at B, and is condensed, thus forming a vacuum, the water falling to 

 the bottom of chamber (H). To remove this water, a vacuum is alternately 

 created and destroyed, six times per minute only, in the lower chamber (G), 

 by alternately raising the steam or water tappet valve (the steam supplying 

 the tappet valve being reduced by reducing valve to 2^ Ibs. pressure). On 

 vacuum being created in lower chamber, the water collected in upper 

 chamber is drawn down through india-rubber foot valve (E) ; and on vacuum 

 being destroyed in lower chamber, the water falls out through the delivering 

 valve (F) into waste water cistern. 



b. LOCOMOTIVES. 



1936. Original Model of Trevithick's Locomotive 

 Engine. (Trevithick's Patent, 1802.) 



Bennet Woodcraft, F.R.S. 



1934a. Puffing Billy, the oldest locomotive engine in exist- 

 ence, and the first which ran with smooth wheels on smooth 

 rails, was constructed in 1813 by Jonathan Foster, under 

 William Hedlei/s patent, for Christopher Blackett, Esq., the pro- 

 prietor of the Wylam Collieries near Newcastle-upon-Tyne. This 

 engine, after many trials and alterations, commenced regular 

 working in 1813, and with tender and two trucks, a total load 

 amounting to fifty tons ran, at an average rate of six miles an 

 hour. This engine worked until the 6th June 1862, and was 

 then purchased for the Patent Museum. 



H.M. Commissioners of Patents. 



1934. The Locomotive Engine " Rocket," constructed, by 

 Messrs. Stephenson & Co. in 1829, to compete with other engines 

 on the Liverpool and Manchester Railway, where it gained the 

 prize of 500/. The Liverpool and Manchester Railway was 

 formally opened for passenger traffic on the loth September 1830. 



H.M. Commissioners of Patents. 



Stephenson's Model of the " Rocket." 



G. JR. Stephenson. 



2210d. Photographs of the first engine employed on a public 

 railway, of the first and of the most modern railway coaches, and of 

 the first two railway bills. Alfred Marshall. 



2212g. Model of Central Rail Locomotive with its rail 

 ( 1 842). Late Baron Seguier, Membre de Vlnstitut. 



2212f. Model of Railway with central rail, 1843. 



Late Baron Seguier, Membre de VInstitut. 



2212h. Model of Central Rail Locomotive, by Baron 

 Seguier and Dumery, with part of the road, 1862. 



Late Baron Seguier, Membre de VInstitut. 



