222 



TABLE 219. 

 COEFFICIENTS OF THERMAL EXPANSION. 



Coefficients of Linear Expansion of the Chemical Elements. 



In the heading of the columns T is the temperature or range of temperature ; C is the coefficient 

 of linear expansion ; A\ is the authority for C; Mis the mean coefficient of expansion between 

 o and 100 C. ; o and ft are the coefficients in the equation / / (i + <^ + ftt >2 )> where /o is 

 the length at o C. and /the length at ( C. ; A 2 is the authority for a, ft, and m. 



1 Fizeau. 



2 Calvert, Johnson 



and Lowe. 



3 Chatelier. 



4 Henning. 



5 Dittenberger, 



6 Matthiessen. 



Andrews. 

 Hoi born- Day. 

 Benoit. 



10 Pisati and De 



Franchis. 



11 Hagen. 



12 Spring. 



The above table has been partly compiled from the results published by Fizeau, " Comptes Rendus," vol. 68, and 



Matthiessen, " Proc. Roy. Soc.," vol. 15. 

 The Holborn-Day data are for temperatures from 20 to 1000 C. The Dittenberger, o to 600 C. 



SMITHSONIAN TABLES. 



