S7S Inquiries inio the Laws of Dilatation of Solids, Liquids, 



we shall subjoin a complete series^ with all the indications neces- 

 sary for calculating them. 



This series does not comprise anv observations for temperatures 

 approximating 100 ■, although we have repeated several times the 

 experiment of the dilatation of the air in boiling water. We did 

 not propose by any means to verify thereby a determination on 

 which no doubts can be entertained; but the coincidence of our 

 result with that of M. Gay Lussac has been for us the best proof 

 of the rigorous exactitude of the process which we made use of. 



17^06 

 16%74 

 18°,25 

 18°,24 



156°,85 

 197°,53 

 2 J 9", 43 



0,6186 

 0^577 1 

 0"55695 





VOLUM E 



in centimetre cubes. 



of of 



cold air. wanu air 



0,7653 .63,526 

 0^7561 34,8573 



0,7594 



318°,1 1 0,52525 0,7603 



53,225 

 66,1728 



76,438 

 43,287 

 69,862 

 92,2875 



We have made several sin)ilar series of experiments and nearly at 

 the same temperatures. By a very simple interpolation and by 

 taking mediums, we have formed the following table, which indi- 

 cates the correspondence of degrees marked by the mercurial 

 thermometer, and those which are deduced from the dilatation of 

 the air. 



Although the experiments which we have given present a re- 

 markable coincidence, we tliought it right to attempt the attain- 

 ment of the same results by a different route. 



In these new experiments we made use of an air-tube of a 

 much greater capacity than in the first, and we placed it in the 

 same way ; only the very narrow tube which was soldered to it 

 was curved at its issuing from the tub, and prolonged vertically 

 for the length of almost five decimetres : it was heated by taking 



all 



