110 
MINUTES OF PKOCEEDINGS OF 
that corrections have been made for the wear of the bore of the proof gun. 
These were obtained by firing identical samples from two proof guns—one new 
and the other worn. 
Stovings. 
Density. 
Mois- 
Pebbles 
Experiment. 
M.Y. 
Pressures. 
ture. 
to 1 lb. 
Date. 
No. 
A. 
B. j 
1 C. 
9. 8. 73 
1-777 
•94 
80 
21. 8. 73 
C 706 
£ 4 
1498 
1537 
20-3 
206 
20-3 
20-3 
17- 7 
18- 7 
11. 8. 73 
1-787 
•99 
70 
n 
[ 70 l 
1467 
1508 
18-1 
19-1 
17- 8 
18- 4 
17-5 
17-5 
12. 8. 73 
1-787 
1-14 
74 
n 
00 so 
o 
1459 
1486 
16- 5 
17- 0 
16*5 
16-9 
16-1 
16-7 
21. 8. 73 
1-799 
•99 
64 
3. 9. 73 
( 726 
l 16 
1433 
1470 
16-0 
17-6 
15- 7 
16- 6 
14-6 
16-4 
27. 8. 73 
1-785 
1-11 
64 
a 
(727 
i 17 
1441 
1478 
14-9 
16-5 
14-8 
16-5 
15- 7 
16- 5 
11} 8 ' 73 
1-793 
1-04 
66 
n 
(725 
l 15 
1434 
1470 
15-1 
15-8 
14-4 
16-1 
13-6 
150 
It] 2 
1-808 
1-41 
77 
9. 3. 74 
(825 
1 110 
1419 
1450 
16-4 
16*8 
16-1 
15-9 
15- 5 
16- 5 
“} 2 - 74 
1-804 
1-37 
78 
a 
(826 
(HI 
1399 
1439 
17-4 
16-6 
16-5 
16-3 
! 14-8 
15-2 
m 2 -« 
1-779 
1-05 
77 
" 
(827 
( 112 
1484 
1535 
22-3 
22-8 
22-1 
23-1 
! 20-2 
| 21-9 
‘From these experiments it is concluded that about 5 ft. must be added for 
100 rounds to reduce the velocity to that of a new gun, and about 2 cwts. 
for each 100 rounds for pressure. The corrections are not shown in the old 
gun in use in 1872,, as that gun as a rule fired much less violent powder, and 
the corrections would probably be J rd less. If we neglect the sample fired 
13. 9. 72, where the pressures are evidently exceptionally high, it will be ob¬ 
served that the powder at first loses in velocity and pressure from its having 
been overdried, but that afterwards it does not materially lose its velocity or 
pressure when it once has reached a normal state of moisture, as it may be 
supposed to have done in November, 1872. 
Some experiments have been made by Colonel Younghusband as to the 
time required to dry powder of large size of grain. The samples chosen were 
inch cubes, and the specimens were dried whole and compared with similar 
specimens broken up to a size rather larger than E.L.G. with the following 
result:— 
No. of 
hours 
dried at 
160° Fah. 
Loss of moisture in inch cubes. 
Waltham Abbey. 
Hall and Son. 
Density 1\82. 
Density 
1-75. 
Density 1*792. ! 
A. 
B. 
C. 
Whole. 
Broken up s 
Whole. 
Broken up. 
Whole. 
Broken up. 
Whole. 
24 
•284 
1-103 
•237 
1-062 
•290 
1-312 
•308 
48 
•464 
1*103 
•402 
1-194 
•501 
1-527 
•484' 
72 
•490 
1-103 
•568 
1-261 
•712 
1-527 
•625 
96 
•594 
1-103 
•663 
1-261 
•817 
1-527 
•659 
120 
•619 
1-103 
•710 
1-261 
•897 
1-527 
•659 
144 
‘645 
1-103 
•805 
1-261 
•976 
1-527 
•681 
168 
•697 
1-103 
•876 
1-261 
1-108 
1-527 
‘703 
192 
•800 
1-103 
•947 
1-261 
1-134 
1-527 
•703 
216 
•800 
1-103 
‘971 
1-261 
1-213 
1-527 
•703 
