CAPTAIN NOBLE AND MR. F. A. ABEL ON FIRED GUNPOWDER. 
235 
Table X.—Giving in terms of the density the tensions existing in the bores of guns 
calculated from equation (30) ; giving also the tensions if the gases are suffered 
to expand without production of work. In both cases the powder is supposed 
to be perfectly dry. 
O g 
o 
U 
o 
ID 
Tensions calculated from equation (30), 
Tensions in close cylinders or where gases expand 
without cooling or production of work. 
jC O 
_§ m . 
•5 . 
£ w 
o £ 
Iviios. 
Tons 
Kilos. 
Tons 
_3 .2 
P-, o 
•M •»£ 
per 
Differ- 
per 
Differ- 
Atmo- 
Differ- 
per 
Differ- 
per 
Differ- 
Atmo- 
Differ- 
2 O ^ 
Sh C 
square 
ences. 
square 
ences. 
spheres.* 
ences. 
square 
ences. 
square 
ences. 
spheres. 
ences. 
6 a 
cm. 
inch. 
c m. 
inch. 
1-00 
1-000 
6772-2 
789 0 
43-00 
5-01 
6554-0 
763 6 
6772-2 
738 6 
43 00 
4-69 
6554-0 
715-9 
•95 
1-053 
5983-2 
693-0 
37-99 
4-40 
5790-4 
670-7 
6033-6 
652-1 
38-31 
4-14 
5839-1 
631-0 
•90 
1-111 
5290 2 
609 5 
33-59 
3 88 
5119-7 
589-8 
5381-5 
579-5 
34-17 
3-68 
5208-1 
560-9 
•85 
M76 
4680-7 
541-8 
29-72 
3-44 
4529-9 
524-4 
4802-0 
519-8 
30-49 
3-30 
4647-2 
503-0 
•80 
1-250 
4138-9 
481-9 
26-28 
3-07 
4005-5 
466-4 
4282-2 
467-7 
2719 
2-97 
4144-2 
452-6 
•75 
1-333 
3657 0 
434-7 
23-22 
2-76 
3539-1 
420-6 
3814-5 
422-1 
24-22 
2-68 
3691-6 
408-5 
•70 
1-429 
3222-3 
390-6 
20-46 
2-48 
3118-5 
378-0 
3392-4 
385-9 
21-54 
2-45 
3283-1 
373-4 
*65 
1-539 
2831-7 
354-3 
17-98 
2-25 
2740-5 
343-0 
3006-5 
351-2 
19-09 
2-23 
2909-7 
339-9 
•60 
1-667 
2477-4 
321-3 
15-73 
2-04 
2397-5 
310-9 
2655-3 
322-8 
16-86 
2-05 
2569-8 
312-5 
*55 
1-818 
2156-1 
292-9 
13-69 
1-86 
2086-6 
283-5 
2332-5 
296-1 
14-81 
1-88 
2257-3 
286-5 
•50 
2-000 
1863-2 
267-8 
11-83 
1 70 
1803-1 
259-1 
2036-4 
274-1 
12-93 
1-74 
1970-8 
265-2 
•45 
2-222 
15954 
245-7 
10-13 
1-56 
1544-0 
237-8 
1762-3 
253 5 
11-19 
1-61 
1705-6 
245 4 
•40 
2-500 
1349-7 
225-2 
8-57 
1-43 
1306-2 
217-9 
1508-8 
236-3 
9-58 
1-50 
1460-2 
228-7 
•35 
2-857 
1124-5 
206-3 
7-14 
1-31 
1088*3 
199-7 
1272-5 
218 9 
8-08 
1-39 
1231-5 
211-8 
•30 
3-333 
918-2 
190-6 
5-83 
1-21 
888-6 
184-4 
1053-6 
204-7 
6-69 
1-30 
1019-7 
198 2 
*25 
4-000 
727-0 
174-8 
4-62 
1-11 
704-2 
169-2 
848-9 
192-2 
5-39 
T22 
821-5 
185-9 
•20 
5-000 
552'8 
160-6 
3-51 
1-02 
535-0 
155-5 
656-7 
179-5 
4-17 
1-14 
635-6 
173-8 
•15 
6-667 
392-2 
146-5 
2-49 
•93 
379"5 
141-7 
477-2 
168-5 
3-03 
J-C7 
461-8 
1631 
•10 
10-000 
245-7 
132-3 
1*56 
•84 
237-8 
128-1 
308-7 
159-1 
1-96 
1-01 
298-7 
153-9 
*05 
20 000 
113-4 
•72 
109-7 
149-6 
•95 
144 8 
We have shown! that the theoretic work which a charge of gunpowder is capable of 
effecting in expanding to any volume v is expressed by the equation 
r C„ — C „ y 
yy _ fV n(! ‘ a )(t r ~t ffil) ^ ^_ A’o(! x)\ Cv +0A (34) 
c. P — c, L v v-*v 0 ) j.' 
* We are indebted to Colonel Aloncle and tbe Commandant Hedon, of the Marine Artillery of France, 
translators of onr memoir, for pointing out that although we have adopted as our standard atmosphere 
that used in France, viz.: a barometric pressure of 760 m.m. mercury and a temperature of 0° C., the 
coefficient we have used in converting tons per square inch into atmospheres is not exactly in accordance 
with our supposition. In the present memoir this discrepancy is corrected, 
t Phil. Trans., 1875, Part I., p. 132. 
2 H 2 
