THE MASS OF A CUBIC INCH OF DISTILLED WATER. 
349 
Height of Q as measured at 25 different points by Whitworth Micrometer. 
No. 
1889. 
Mean reading. 
t. 
Divisions of micrometer. 
O 
1 
Jan. 7 
+ 4555 
61-8 
2 
+ 4500 
3 
+ 3998 
4 
+ 3842 
5 
. 
+ 3459 
6 
„ 8 
+ 4335 
6L7 
7 
95 
+ 4257 
8 
99 
+ 3980 
9 
99 
+ 3938 
10 
+ 3935 
11 
?9 
+ 4203 
12 
? 5 
+ 4200 
13 
?? 
+ 4000 
14 
9? 
+ 4000 • 
15 
„ 10 ■ 
+ 4000 
62-0 
16 
+ 4038 
17 
+ 3925 
18 
9? 
+ 3875 
19 
+ 3928 
20 
9? 
+ 4054 
21 
?? i*j 
+ 3695 
61-8 
22 
99 
+ 3700 
23 
„ 15 
+ 4000 
24 
+ 4358 
25 
95 
+ 4450 
Mean + 4049 
For the standard 3-inch measure, the mean reading was found to be = 4799'5 
divisions, hence the height of Q was taken as 3 ’08 84 8 5 inches. 
By the above measurements of the height of Q it may be seen that the quartz 
gravimeter is not of true cylindrical form, and that its height could only be approxi¬ 
mately ascertained. After allowing for bevels on the upper and lower edges of 
the cylinder, as measured by the microscopic comparator, its cubic contents were 
taken as 23 , 04015 cubic inches. 
Weighing of Q in Air. 
Date, 1888. 
Description of weights used ( w ). 
Result. 
Mean t. 
Fahr. 
Barometer 
inches. 
Jan. 3, 10 a.m. 
Gilt lbs. 31, 32, + gilt grains 1000, 300, 100, 1 
20, 10, 1, 0-5.f 
grains 
15426*68 
57-35 
30-81 
After immersion. 
,, 5 P.M. 
. 
15426-68 
57-33 
30*81 
