APPENDIX A. 227 



duced; same experiments on several metals and 

 on wood. 



To strike a piece of lead in various ways, to 

 measure the motive power consumed and the heat 

 produced. Same experiments on other metals. 



To strongly agitate water in a small cask or in 

 a double-acting pump having a piston pierced with 

 a small opening. 



Experiment of the same sort on the agitation of 

 mercury, alcohol, air and other gases. To measure 

 the motive power consumed and heat produced. 



To admit air into a vacuum or into air more or 

 less rarefied; id. for other gases or vapors. To 

 examine the elevation of temperature by means of 

 the manometer and the thermometer of Breguet. 

 Estimation of the error of the thermometer in the 

 time required for the air to vary a certain number 

 of degrees. These experiments would serve to 

 measure the changes which take place in the tem- 

 perature of the gas during its changes of volume. 

 They would also furnish means of comparing these 

 changes with the quantities of motive power pro- 

 duced or consumed. 



Expel the air from a large reservoir in which it is 

 compressed, and check its velocity in a large pipe in 



