298 Dr. W. Miller on a 



The following are the results for dry air obtained in an 

 ordinary laboratory experiment without any corrections being- 

 applied, either for the expansion of! the flask or for the 

 error or the thermometer due to the part of the mercury 

 thread projecting out of the heater. 



Expansion. Differences. 



c.c. 

 3*6 c.c. 

 7*55 c.c. 



Temperature. 



0° c. 

 10° c. 



20° 0. 



30° C. 



40° 0. 



50° C. 

 00° c. 



70° C. 



80° 0. 



90° 0. 



100° O. 



11-0 

 14-8 

 187 

 22-1 

 26-1 

 29-4 

 32-7 

 36-5 



c*c. 



c.c. 

 c.c. 



C'C. 



c.c. 

 c.c. 

 c.c. 

 c.c. 



3*6 c.c. 



3*95 c.c. 



3*45 c.c. 



3*8 c.c. 



3-9 



3-4 



4-0 



3-3 



3-3 



3-8 



c.c. 

 c.c. 

 c.c. 

 c.c. 

 c.c. 

 c.c. 



Coefficient of expansion 



36-5 



= -00365. 



100 x 100 

 The results are shown graphically below. 



Fig. 2.— Expansion of Dry Air (uncorrected). 



^ 35 

 k 



'fi 30 



I 



25 



20 



>• 15 

 I'" 





















/ 



































> 



















/ 





































Z 



\ 















y 



















A 



S 



















Q°C 10° £0' 



30 



W 50 60 

 TEMP£R/1TU/?E. 



70 



80 



90 



100 c 



Further observations were undertaken to investigate the 

 degree of" accuracy attainable by the instrument. A 



