PP seal GUN-COTTON AND GUNPOWDER. 
the gas produced in this manner consisted of nitrogen, binoxide of nitrogen, 
carbonic acid, carbonic oxide, marsh gas, and aqueous vapor. 
° 
Volume. | Pressure.| Temp. | Vol. at 0° 
and J m. 
° 
Original volume. ...---.------------------- 374.53 0. 1156 12 42.3) 
Thin Jive) Siketehany lope (OS a Ono Sab BenpEeeee pees 415. 83 0. 1768 95 54.56 
After absorption of NO?.....-..------------ 361. 80 0. 1078 11.2 37,47 
After absorption of @O?.....--.------------ 328. 06 0. 0850 10.5 26. 8d 
Aifemauciian Olean. 22 ses. tence +. cn - ol ae A831. 25 0. 2372 LPR 109. 26 
After addition of oxygen------------------- 497.56 0. 2510 12.5 119, 41 
After explosion ...---------- -------------- 466, 21 0, 2212 11.2 99, 07 
After absorption of CQ?..------------------ 430, 57 0. 1855 10. 4. 76. 97 
Ati ncalinoreyo ry BREE Bs BAS SRS SS Seca asec 477.25 0. 2301 aE) 105, 29 
After explosion .......------ -------------- 443, 38 0. 1983 12.6 84. 08 
The quantity of NO? and CO? is obtained from the absorptions, the quantity 
of water from the increase in volume in the steam-bath ; the quantity of nitro- 
gen is obtained from the volume 76.97, which remains after removing the car- 
bonic acid resulting from the combustible gases, by subtracting the uncombined 
oxygen and the nitrogen contained in the atmospheric air added; while the 
combustible gases are calculated from the formule in Bunsen’s gasometri¢ 
method, 
Cabrantngg sie GSU oo sO S 2 Se ee Pees uy eta 
Jk 21) SLE ia a i ee ee ne em eae, a mete aa = aes 
oO 
EW SAENOREN ise daisies eynye eh ele mien PAA ca N dy hs SARL shat ve shy —=P—P, 
in which P is the quantity of combustible gases, P, the carbonic acid produced 
in combustion, Py the oxygen used in combustion. 
Hence the gases from gun-cotton contain in 100 parts— 
| 
| 
By volume. By weight. 
i 
Comegii@ Crs eatabee Santee ase Sees soso deeHabe SESSA TSE Seis se 28. 55 28. 92 
(CunliGnike el Sogsecsocesen cds Soe mseieds- soe Doder Ee atoeted Shoal 30,43 
RGIS CP) BBE ia Sees Sec Seee ME CO ASS Geo rne PSP Heese. 55 oo 11.17 6. 47 
MORI GON MIUTOREN 2/2 oc) to < clseye shee claire oa Sion cies cee 8.83 9.59 
i eee eae se artes ee oer cere enem on sa 8.56 8.71 
(CEHIGI Se cope Sree oteE Meee Aas Beat. a ae ae teen Canerece Risto. 1 1.85 1. 60 
AGMEOUS MAP OL sue cinco =c msec ote ee me sie si crepe orate So ene ee 21.93 14.2 
The gun-cotton used had the average composition C*H?™N°O*, from which, 
after subtracting the results of the analysis, the separated carbon is obtained} 
which is included in the above analysis. 
This simple and apparently faultless method has repeatedly shown that, by 
using a somewhat large quantity of gun-cotton under the same circumstances, 
when therefore the combustion takes place under comparatively greater pres- 
sure, the quantities of the products of combustion change, and the quantity of 
