BETWEEN THE FREEZING AND BOILING-POINTS. 
193 
In Group II. the agreement is much better, and it can hardly be said that the 
variations can be attributed to other causes than the setting of the barometer. For 
tests made on the same date, where the interval was repeated with but a small 
change in barometric reading, which could be followed by the vernier without other 
adjustments, the readings are as a rule exceedingly consistent. 
The two tests in Group III. are given in full. 
Group III. Date, September 26, 1899. 
First determination. 
Both in ice, reading of bridge-wire . 
C in ice ; P in steam. 
Second determination. 
Both in ice, reading of bridge-wire . 
C in ice ; P in steam . . . 
Both in steam. 
23-173. No coils. 
23-757 + coils, 640 + 320 -f 10. 
23-175, 23-172. No coils. 
23'646 -f- cods, 640 320 -j - 10. 
25-143. No coils. 
Barometer in first determinations. Uncorrected, 75"073 centims. at temp. 18°"9 ; 
corrected, 74"851. 
Barometer in second determinations. Uncorrected, 75"092 centims. at temp. 18°"8 ; 
corrected, 74'870. 
In first determination. In second determination. 
Bridge-wire .... — 0"584 — 0‘473 
Bw. correction.... 4 3 
- 0-588 — 0-476 
Coils. 969-876 969*876 
969"288 in box units. 969"400 in box units. 
Barometer correction . -}- "4093° + "4025° 
F.1. 97‘3381 in degrees. 97 "3425 in degrees. 
Meanvalue^. . . . 97"3403. 
Group IV.—Coils 640 + 160 + 80 + 20 = 900-128 units. 
9 units = 1° C nearly. Box 2. 
Date. 
Bridge-wire 
corrected. 
Total units. 
Barometer 
corrected. 
F.I. corrected to 
7 6'00 centims. 
February 14, 1900 .... 
+ 4-143 
904-271 
75-778 
90-5009 
„ 14 „ . . . . 
+ 2-195 
902-323 
75-191 
90-5006 
>> 16 ,, . . . . 
+ 4-307 
904-435 
75-816 
90-5037 
ti 16 . 
+ 4-328 
904-456 
75-838 
90-4994 
» 16 . 
+ 4-361 
904-489 
75-846 
90-5002 
VOL. CXCIX.—A. 2 C 
