170 
Steam Engine, 
I make these observations, in reply to some letters on 
the subject, which require to be thus noticed. 
The plan of this work will not permit me to insert 
plates of all the steam engines subsequent to Watt’s. I 
wish it would. The subject is of great importance. 
James Watt, of Birmingham, would have been cheaply 
purchased by England at the price of twenty millions 
sterling, I foresee the time when civil engineers will be 
rising up among us. To such persons this paper will be 
of use. But though I cannot insert every thing I wish 
to see on the subject of steam engines, I shall insert every 
thing that appears to me of thief importance in the way 
of improvement, so that this essay shall not leave any prin- 
ciple unknown. In the present essay, and in the refer= 
ences I am now about to give, every thing material to be 
known respecting steam engines, either in theory or in 
practice, so far as it is contained in English or French 
publications, may be found. I much wish the whole 
was published together in a separate volume. 
Architecture hydraulique par M. Prony, 2 vols. qto. 
Repertory of Arts, old series. 
Hornblower’s engine with pi. IV. 361. IX. 290. and N. S. VII. 81. 
Cartwright’s X. and XIV. 362. and 1 Phil. Mag. K 
Robertson’s XVI. 364. 
New series. 
Boaz’s engine with plate VIII. 321. 
Trevethick’s IV, 241. 
Rider’s VII. 258. 
Murdoch’s XIIL 11. 
Woolf’s VI. 4. VIII. 86. 
Deverill’s VIII. 81. 
On the force of Steam I. 22. 
T. C. 
