
224 STORRS AGRICULTURAL EXPERIMENT STATION. 
TEHSTS OF THE ACCURACY OF THE APPARATUS. 
The accuracy of the measurements of heat and of carbon 
dioxide and water has been tested by two methods. In one 
the heat determinations were tested electrically. In the other 
the determinations of heat, water and carbonic acid were tested 
by burning alcohol inside the calorimeter chamber. 
The electrical tests of the heat measurements.—For this pur- 
pose a wire resistance coil was placed inside the chamber. 
This was connected with wires passing through the wall to the 
outside and connected with a voltmeter and an ammeter and, in 
some instances, a Thompson balance. The amount of heat 
given off inside the apparatus was calculated from the current 
and was also determined in the water passing through the ab- 
sorbers. ‘The details of the arrangements and observations 
are reserved for future publication. The final results are given 
in table 4o. 
TABLE 49. 
Summary of electrical test experiments. 











sO : | a rel a . 
Sab) Soe hoes 2: | 88 
DATE. aes Na | 32 © § 5S One 
5 8S me |e e 5m ot ug 
A ors} O a os 
H, Calories. Cal. | Cale Cal. 
March 20, 1897, - - 13-20 | IO0I.9 | -g.0 992.9 989.5 | 100.3 
March 25, 1897, - - 6-05 528.8 | -6.0 522.8 522.1; 100.4 
March 26, 1897, - - 7=17 ) 12521 | —T29P 1260.9 whos aan 99.8 
April 30, 1897, - - 6-00 20ed 7 0.0 aia ous 99.5 
January 8, 1898, - - 4-00 23314 | —4.0 229.4 230.5 99.6 
otal sere - = ht — | —_ 3017.4" |* 8016394 OO 

One objection to this use of the electrical method as a 
test of the accuracy of the apparatus is found in the fact that 
the conditions were not the same as obtain in an experiment 
with a man. ‘There was no ventilating current of air through 
the apparatus, and no water or carbonic acid was given off 
_ within it. The tests which follow were made by burning ethyl 
alcohol inside the apparatus while the ventilating current was 
passing through. ‘The devices were such as to insure complete 
combustion of the alcohol, as shown by somewhat extended 
experiments to be described elsewhere. The carbonic acid, 
water and heat were measured in the same way as in an actual 

