286 DAY AND SOSMAN : EXPANSION COEFFICIENT OF GRAPHITE 



TABLE I 

 Observed Expansion of Acheson Graphite 



'n 



EXPANSION 



II. Platinum resistance furnace 



1911 



January 6. 



January 8.. 

 January 10. 

 January 23. 



January 31 . . 

 February 12. 



@XW 



would be the temperature of maximum density. According to 

 Fizeau's measurements, diamond has a similar point of maximum 

 density or zero expansion at — 42°. 



The published figures on the expansion coefficient of graphite 

 vary widely. We do not know of any previous determinations 

 on Acheson graphite, nor have the manufacturers a record of any. 

 The following data have been obtained on natural graphites: 



