180 
MINUTES OF PROCEEDINGS OF 
and of the screens are made nnder precisely the same conditions . With ten 
screens, there will be an absolute error, greater or less, in the records of the 
first and last screen, but whatever be the amount of error in the records of 
the intermediate screens, there can be no gain or loss of time. If one 
interval be a little too short, the next will be a little too long, and what is 
taken from one must be added to the other. The problem is to distribute 
the small errors between narrow limits. But suppose the nine intervals of 
time were measured by nine independent instruments, there would be an 
error, greater or less, at the beginning and end of every interval, making 
eighteen. And besides this there w 7 ould be the nine different rates of the 
measurers of time, and various sources of error peculiar to the construction 
of so many independent instruments. 
Eighteen rounds were fired to test the chronograph. No particular care 
was taken to examine the form and weight of the shot. The bore of the gun 
was about 3 inches, and the weight of the projectile about 12- lbs. 
ROUND 1, November 23,4865. 
Clock. 
Clock. 
Beat. 
Reading. 
Correction. 
Corrected A 
Reading. Al 
a 2 
Beat. 
Ai 
a 2 
1 
2 
3 
4 
5 
6 
7 
8 
6-880 
14-710 
22-510 
30-290 
38-020 
45-725 
63-410 
61-060 
+ -001 
- -001 
- -001 
- -Oil 
- -002 
+ -002 
- -001 
•000 
6-881 v.coq 
14-709 + Z 
22-609 + l i°° 
30-279 + '.'™ 
38-018 + '”» 
46-727 + I.*}® 
63-409 t 
61-060 + 7 661 
- 28 
- 30 
- 31 
- 30 
- 27 
- 31 
3- 0 
•5 
4- 0 
•5 
6-0 
*5 
6-0 
22-509 
26-398 
30-279 
34-152 
38-018 
41-876 
45-727 
+ 3-889 
+ 3-881 
+ 3-873 
+ 3-866 
+ 3-858 
+ 3-851 
-8 
-8 
-7 
-8 
-7 
Clock. 
Screens. 
Beat. 
Time Table. 
Ai 
No. of 
Screen. 
Reading. 
Correction. 
Corrected 
Reading. 
4-5 
•6 
•7 
•8 
•9 
6-0 
•1 
•2 
•3 
5-6 
•7 
•8 
•9 
6-0 
34-152 
34- 926 
35- 699 
36- 472 
37.245 
38-018 
38- 790 
39- 562 
40- 334 
41.105 
41- 876 
42- 647 
43- 417 
44.187 
44- 957 
45- 727 
+ -774 
+ -773 
+ *773 
+ -773 
+ -773 
+ -772 
+ -772 
+ -772 
+ -771 
+ -771 
+ -771 
+ *770 
+ -770 
+ -770 
+ -770 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
36-190 
# # # 
38- 210 
39- 240 
40- 280 
41- 330 
42- 330 
43- 440 
44- 500 
45- 580 
-•002 
* * 
+ •002 
•000 
-•002 
-•005 
+ •049 
-•001 
+ •005 
-•004 
36-188 . 
87-195 T 
38-212 T 
89-240 y 
40-278 T 
41*325 J 
42*379 J 
43- 439 T 
44- 505 J 
45- 576 + 
Ai 
1-007 
1-017 
1-028 
1-038 
1-047 
1-054 
1-060 
1-066 
1.071 
A2 
+ 10 
+ 11 
+ 10 
+ 9 
+ 7 
+ 6 
+ 6 
+ 5 
By the help of the time-table the corrected screen readings are to be con¬ 
verted into time measured by beats of the clock. As the clock used did not 
