GUNPOWDER. 
d pre- 
poedets; Of powder m 
16 of — and use of charcoal sina the ftrongeft, and 
; With all thefe 
oth a lefs dad a 
-chare 
o tried in the mor roa ct yin the 
common proof powder, and was to maintain a {mall 
pein —_ annie made without car in the pro- 
portions ab ted was in the mortar eprou- 
vette, and wal he following fingular edt when the 
charge was only two ounces, it proje ected a 6olb. copper ball 
pe feet, and the ftrongeit powder with fulphur projected it 
249 feet; but ina charge of three oun oi the — r pro- 
jetted the ball 475 — and the latter only 472 feet: an 
the other hand the great inferiority of force in fet Gall 
siecernn of m pow rder without hiphae has been juit 
Ai 
When oo fever She BR of anyone are properly 
in the man 
hE ee ts not hard to account foe : the char ddl = 
of the whereon the fpark falls, catching fire like tin 
der, eae eins ans and nitre are readily melted, and the fairer 
alfo break ; and at the fame time the contiguous 
er pare ! it is known, that falt- 
wher erited, rarefies ns epochal degrees > 
of pt Newton tg vty on sy point : the charcoal 
and in apoye r eafily take fire and kindle the 
nitre ; and the bir 
ei tet greater 
tion, whereby the heat is arther cogent, ache 
ihoer. aft oe eee = . 12. 
made more vehement a 
Tori yah ‘of tartar be mixed ‘with panes and that 
‘mixture be cramer conan explofion will I be 
the iam 1g a a py ew $ “bes 
. © 
d and the moitture, whic 
i fic forse evo hundredth ps 
the inftant of their extrication. - See this theory largely id 
om i. 
eee 
From count $ 
cafe the wah was Somid to be pong to 
m 
He be cars t at: re feems to be no. bi 
retain, appear to be uly fufficient to accou 
by means of fteam only. 
of carbon: but t 
fi ar 
; de ciel acid Saat and carburetted Sane he ele 
uret of | eee arty by a part of the 
ho alkali af the and 
Oe damp gun 
M. de la Hire, in the Hiftory of the Hesck Academy for 
ce afcribes all.the force and effece of The feel to the 
{pring © or elatticity of the air inclofed i “A the 
reof, and in the intervals or r {paces 
a powder being - kindled, fets the eae a yay erin 
to. ht ae 
hich the whole 
ee 
‘gnd- obferae’ 
of this article, 
e time when the 
ft addition i its cteAlcity could ac- 
wou amount 
sient ae ee 
barcl "Aikin’s 
of air 
the fe the “powder ‘itfelf only ee: 
may put the air in: action ; after 
i ie done by the air alone. 
ut it appear from the experiments 
tions f Mr. Robins, recited in the — 
in its natural 
exerted by fired po 
=e eed: the. force-of ite smut 
fired in a vacuum or i® 
on a permanent elaftic fui 
receiver. be exhausted, and the gunpowder be then - 
on, the iron, the powder will take fire, and the meres 
will fuddenly defcend upon the explofion ; and 
jately afcends again, yet it will never rife to 
flood at, but will continue deprefied 
and fpce proportion to to the quantity of gunpow ewe 
as let fall on the irom. 
By this means {firm {mall 
eu" wh sa ‘ ae 
- yi w this experiment, ach has been 
often. ves the propotition with refj to the 
rod elaitic fluid in a vacuums ff 
the defvent of the gage could only be effected by the pr 
fure of fome new generated fluid in the receiver, balance 
in part the preffare of. the external air. That: this fluid & 
