for Measuring the Expansion of Solids. 201 



the air-chamber, I laid the register upon the fuel in the body 

 of the furnace, and it thus became only partially melted, and 

 half the bar remained in the solid state. The amount of the 

 expansion indicated is therefore evidently deficient, and must 

 be discarded from the table. A similar accident happened 

 once with brass ; but this 1 have been able to rectify by sub- 

 sequent trials. 



I shall now arrange the results of my experiments in two 

 tables : — the first showing, in arcs of the scale, the expansion 

 of pure metals from 62° Fahr. to 212°, 662° Fahr., and their 

 respective melting points ; and the second exhibiting the 

 expansion of certain alloys to the same points. 



The bars were in all cases of the same length of 6'5 inches. 



Table XIIL 



Showing the progressive Expa7ision of the following pure Metals 



to their Melting Points. 



Table XIV. 



Showing the progressive Expansio7i of the following Alloys to 

 their Meltinp Points. 



The first remark which I shall make upon these tables re- 

 gards the fusing points of the pure metals. Having ascer- 

 tained for each the expansion due to certain definite incre- 

 ments of temperature, and the utmost expansion which they 



Third Series. Vol. 1. No. 3. Sept. 1832. 2D 



