GUNNERY. 
was lefs falt-petre Saget in it than in real powder, 
nearly i in the ratio o o 7. Now thefe two propor- 
tions compounded, make ce proportion of 15 to7, in 
which proportion muft the quantities of eid _unfired 
‘be reduced, in order to determine the quantity of fine 
good powder that might be fuppofed to remain unfired 
in the Sh sips? brought to confirm the aforefai 
theo: 
it appears, by experiments, that the velocities of 
bullets. placed i in the fame fituation, are in the fab-dupli- 
f the charges; confequently. the defi- 
ve been no more tha at a, 
medium, or ', of the whole charge, ee would pro- 
ucé a deficiency of .), of, the velocity only ; a difference 
lefs than what frec quently occurs in the exadelt repetition. 
of the fame experim 
This, it is bs Ry is fully fuffic ient to jufify the 
principle in queition ; efpecially, as in all cafes. of 
ufe, the length of ~~; weg in proportion to. oe quan- 
tity of the oa e much greater than in_ 
es here ee po Phil. Tranf.; N° oa P+ 450, 
452, &c. or Martyn’s Abr. vol. viii. p. 260. or Robins’s 
Aath. Tratts,. vol. i. p..t cc. aud fee t 
periments of the committee in the. Tranfactions, N° 
Pp: 172, 173, &c. or Martyn’s Abr. vol.. viii, p. 2530 
&e. 
The greatet number of thofe who rer written on. the 
manner in which powder takes “< have fuppofed it to be 
done by regular degrees 5 the firft. 8 firing thofe con- 
. tiguous, _— they the ne: 3; and it has been 
a ht that a. caudicagabaes aan was re i 
' con Semi for Mr. Daniel Ber- 
eppamns nts made at Peteribur h, thatthe greate ft’ part fteel ed 
charge efcapes out at dhe e unfired,; and that: opening cut in the lower piece of ike ok 2 
the fmall part which is fired, does. not firestill itvis! phe "tnfteument being Fae Poin. eck a 
near the mout . any theories too shave been capatpoied, pendulum, the refpe< Be ones a its centre of gravity 
on the time of the progrefs of the fire amongft the grains; and of its centre of “ofcillation from its axis of fufpenfionb 
and the different modifications which theforce ef powder knows, it may Ly Sage AO Git aan 
did thence receive ; and it has been es ote RE communicated so peraceme bias : pereuon of «hall 
that the proper denashe 10 of pieces were determinable: fi ae 
this principle; fo” they. fhould be along: enough: to to. 
= time forall the powder to fire.» 
. i 
But no fuch regular and progiefive Reps pea ober cbfervable ibra 
7 
in the lofion, for confidering tha 
sie weight: of gest 5: gets ‘ae doub ae it 
time of a contin 
- force receives but 
an n joc erable augmentation ; and that 
e 
ance iron, having a broad part at | 
a, has Shaan from fome be 
ing: and trebling © the ufual char, the powder thus: 
dent che | iene’ elocity 
be fuppofed to be kilos before the bullet was { 
moved from<its pl ee? 
And the experiments: repireed by the committee of the 
Society; beforesmentioned, are ftrong proofs that 
the powder is not fired in the progreffive manner ufually fap. 
pofed; for when the fhort barrel Nag charged with twel 
pen -weight and fix penny-weicht refpe@ivel: » the quane 
poeple : wder —< vital nf 2 hele twelve 
ola 
gh the 
with t 
% 
= 
the piece was srasted with twelve penny- pee ‘ 
additional fix penny-weigtit was ‘confumed in a: fhorter time: 
See Phil. 'Tranf. N° 469. p. 
“Mr. R 
This: may es » effebted io means jf a sna iat sf 
ottoem, covered with a thick 
piece of wood which is faftened to the iro: n by terewt® 
Then having three poles joined together by their tops, and 
{preading at botto h ga 
nod ieiay he 
m is Haig ay means” ee 
eevee, which mate its axis of fufpen fion, and on 
ic ie t to vibrate wit teat freedom. Som ethin 
or increafed at ; 
cans of afcrew. To the bottamn m3 the pendulum should 
ened a narrow ribbon, which between. 
» may hay hang loofely down, by. means of an 
Mw tt Oy 2e5s | 9 
e powder in the’ barrel, its’ makes 
