III. PRIME MOVERS. 451 



Newcomen Engine, repaired by Watt, the property of 

 Glasgow University. Kir William Thomson. 



Engraving by T. Barney (1719) of the steam engine near 

 Dudley Castle, invented by Captain Savery and Newcomen, erected 

 by the latter 1712. Thos. Dow, Exeter. 



Engraving of Newcomen and Savery's Engine. 



Bennet Woodcroft, F.R.S. 



1932. Sectional Model of a Cabinet Steam Engine. 



H. M. Commissioners of Patents. 



This is a sectional model of a steam engine in the Patent Office Museum, 

 and was made for the purpose of showing the following improvements in the 

 steam engine made by James Watt. (The engine in the Patent Office Museum 

 was the property of James Watt.) Improvements above referred to : 



a. Making the engine double acting. 



/>. Keeping the cylinder heated while the engine is at work by surrounding 

 it with steam. 



c. Using a separate condenser and air pump. 



d. Parallel motion. 



e. T'.ie governor. 



/. The D slide valve. 



1828kk. Model of a Steam Engine, made by James 

 Watt, which since 1 799 has been used to pump water from the 

 mines of Almaden. This engine was the second set up in Spain. 

 The first steam engine employed in Spain was placed at the 

 arsenal of Ferrol, on Newcomen's design, improved by Watt and 

 Boulton. Royal School of Mines, Madrid. 



182811. Flan of the Steam Engine used to pump water 

 from the mines at Almaden, drawn in 1830, by Vi cento Romoro. 



Royal School of Mines, Madrid. 



1828mm. Flan, Outline, and Sections of the Boilers 

 of the Steam Engines used in the quicksilver mines at 

 Almaden, drawn by Vicento Romoro, in 1830. 



Royal School of Mines, Madrid. 



1930. Original Model of Stirling's Air-engine. Made by 

 the inventor. University of Edinburgh. 



1940. Working Model of Stirling's Air Engine, presented 

 by the inventor, the Rev. Robert Stirling of Galston, to the Natural 

 Philosophy Class of Glasgow University, and used constantly for 

 lecture illustrations. Sir William Thomson. 



I960. Working Model of Atmospheric Engine, with sun and 

 planet motion. Glasgow Mechanics' Institution. 



Ff 2 



