458 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



the higher pressures. The results of Parsons and Cook differ from 

 those of Amagat in the same direction as those found here and by 

 about twice as much. The values given in the table as the result of 

 the present work were calculated from the data of Table XXXI. on 

 page 539. 



.010 r 



.009 



.008^ 



.007 



,006 



005 



.004^ 



.003 ; 



DOZ ■ 



.001 ;, 



liJ-OOl i 



^ -.ooz ; 



^-003 

 > -.004 i 



o 



»- 



a 



Cd 



o 

 u 



"1 



■/ 



3 4 5 6 7 



pressure.kgm/cm'xio:' 



; i nn':;;i;!rBrit 



<3 



10 



Figure 3. The deviation curve for water at 22°. This is to be used in 

 combination with the formula on page 454 in determining the change of 

 volume at 22°. 



The results obtained by the second method below 0° next concern 

 us. To give the original data would occupy so much space as to be 

 out of the question. The methods and the details of the calculation 

 have already been described. It is sufficient to give here some infor- 

 mation about the actual data, and the probable accuracy. Four runs 

 were made with water, at -15°.8, — 10°.2, — 5°.0, and 0°.0, and dis- 

 placement and pressure measured at respectively 8, 10, 14, and 17 

 points. Each of these pressure measurements was the mean of two 

 readings, and the displacement measurements the mean of four. The 

 auxiliary experiment with the lower cylinder full of bessemer was also 

 made at four temperatures : — 17°.7, -12°.2, — 6°.0, and 0°.0, and the 

 number of points at these temperatures was 14, 15, 13, and 16 respec- 

 tively. The auxiliary experiment with the lower cylinder full of gaso- 



