- 
and in winter. Indeed, confidering that the fame quantity 
of 
is generated ina vacuum and in commou air, vit is: difficult 
to conceive how this foree can ra affedted dby the Seen or 
lefs denfity of the atmofphere- 
ut the Sa of the ait has a’ very great influence on- 
$e fer force of powder ; for that quantity which in a dry fea: 
fon would communicate to a ballet the velocity of 1700 feet 
es one- erp will not in- damp: w eather communicate a 
f more than 12 or 1300 feet'in a fecond, or even 
i, sn the powder be bad and aegligeitly ~— ; — 8 
Math. “Tracts, ‘ vol. i. p. T01, 
is agrees with an ex cnet says before a committee 
aE the Royal Society, w er having bee 
steial put ito a phial plied: in oiling water, ‘inl a ball 
out of a mortar twice as far as the fame A aeersg of powder | 
‘taken out of the fame barrel before ity 
- Now the ranges: under the fame dicumeuaae 
ming eaeatecd Se: bein 
ent, will be to each other - 
ball, thef 
y.as U7 to 12, which give ranges as 289 to 1 Phi 
Prank N° Tis p- 182, 183. mg isi oo 
~ Tf, powder be-damp, fhot made with equal- quantities of it 
jout of the fame percel, will differ conhiderably from << 
aps ten times more than if the powder was in - 
‘good order. A fmail charge feems to lofea 
“Of its'foree | ‘than ‘aw largers reach being! 
of chatge, 
ae of the velocities ‘of the 
tage siti 
ath ‘ 
“Feel Aa the piece, after’ relay much ee what sie om 
‘der. : 
from’an’ — ogee dry 
w ; cert in. v AD 
‘by increale in’ cigs a ‘parcel of 
Seer oes 
t, That. ore 
hat the moiture of the atmo here hias a 
from this, mage acne : 
having a’ fire in’ it ‘e 
oft above +35 | prsfiersd 
in lels than two hours by being - 
a 
‘fire, it caniiot be doubted but that the twentieth or 
eae qealepod cassie cok wer preva 3 r 
_@ certain quantity of water will 7 t - 
“its firing-at all,’ # cannot ; iow every degree 
‘moitture muft abate the’ violence of »the -explofion ; and 
“Tt is to be” phlened, alien shi moitture imbibed 
ew render it ‘lefs active when 
GUNP OWDER. 
eeived-; and ‘it Wisiehe fame with thofe made-in the night fire the - 
that elattic: — in which: se force of powder confifts, © 
ried by 
sgt priaheal. imps A = 
pow - 
hibteure-ietig) the ar and ast é 
very good : 
pares a ewe with a gr 
fteam of -hot-w: “was ob: 
fein wei: % 
d powder, 
ounce of: powder’ eek for ‘vity 
» bemg uni 
its weight $oone : 
be boat n of damp powder are” not Hard to account 
ies a sitions li ains e near cans for. then, tl 
each Sb nk flame is not fufficient to explode its ae 
‘grains y yet the whole on them altogether grows 
Ttrong: enough at laft tolend i ina hee ae 
ay two or. three in 
dred wiht 
nta "Robin ws hay p 1045. eerste 
he» flame 
"Phe, ielocity 
Be: 
> “o 
He 
nee 
ats 
as 
6. = 
2.2 
ase et 
SEs 2a 
An 
moitter than w hen this experiment sare 
‘more moiftthan'a room withia Gne 
thirtieth -impraé 
“exp »eTh PEO 
