396 ME. W. HOPKINS ON THE CONSTEUCTION OF A NEV CALOEIMETEE 
II. Same Disc of Glass. 
Time = 300 beats. 
Height of barometer = 30-25 inches. 
= -76 metre. 
Number of 
experiment. 
Temperature of the 
radiating surface. 
Eeadings of the 
calorimeter. 
Difference of the 
readings =R 2 ~®i- 
Temp>erature 
of the air. 
(U 
f Ti= 24^-0 1 
ITj=244*5 J 
f Rj = 62-55 1 
\R2=64-98/ 
0 
2-43 
(2) 
/T, = 246-5 1 
1 X 2 = 245-0 f 
/Ri = 62-6ll 
I R2=65-00 / 
2-39 
63 
(3) 
/Ti=247-ll 
1X2=246-6/ 
/Ri=62-651 
IR2=65-23/ 
2-58 
64 
(4) 
/Xi = 248-4l 
1 X 2 = 247 - 4 / 
/Ri=62-641 
\R2=65-26 / 
2-62 
(5) 
/Xi= 248-81 
1 X 2 = 248 - 5 / 
/Ri= 62 - 6 n 
IR2=65-14/ 
2-53 
64-5 
(6) 
0 
00 
II II 
r Ri = 62-59l 
L R2 = 65-05 / 
2-46 
(7) 
/Xi = 249-3 1 
1 X 2 = 249-0/ 
r Rj = 62-65 1 
IR2=65-10 / 
2-45 
(8) 
X, =249-5 
f Rj = 62-50 1 
\R2=64-97/ 
2-47 
64 
Hence we obtain 
(T)=247°-6 (F.), 
(R)= 63°-8I, 
(T)-(R)=I83°-79; 
and hence, for the mean of these eight experiments, 
I7°-6 (C.), 
^=I02°-1; 
and the mean value of 
R,-R, = 2-49. 
This is for the time of 300 beats ; therefore for 500 beats we have, as a mean value, 
R3-Ri=4-16. 
