GUNNERY 
_ By comparing o eorrefponding wegitics. | in thefe two 
fat courfes, viz. 613 a 
was 28% ounces, and 18% ounces; and for eight 
ounces of pow der, 28} ounces, andi 183 ounces ; the recipr oral 
fubduplicate ratio of the former will be that of 1 to 1.22 
and of the latter that of 1 to 1.241 ; which are little differ- 
ent from the real ratios sate: found. The conclufions at 
fo that it would be a great improvement to make ufe of a 
fhot of a long form, or of heavier matter; as it would 
o be to diminifh the windage ; for thus one-third or bo 
of ne uantity of powder might be faved ; and by co 
thee te o laft improvements, half the ee! of 
night be faved ; i > made 
e the execution 5 Rie Bas 
times ita | tes by difchargin a fhot of two or tues i 
weig its natural bail or round hex, Tn vgn ons 
ip might difcharge fhot as heavy as thofe of the 
gr telt now made ufe-of, Experiments of this kind, per- 
great 1 with s of various lengths, would likewife ferve 
to determine the juft length of cannon-for fhootin fartheft 
with powder. By means of fuch experi- 
nents ly Scaied and varied, we woe be able to 
lye relating to military projeétiles, ‘except 
fuch as depend on the re/j/lance of the air to bodies 
by DLE init, Seea of er account of the rage aia nile 
ap tab 
n Dr. Fiutton's s Trade: 3 (vol. i i. publithed i im 1786, 
has detailed, at great length, another 
ier extenfive parte of cemineus carried on at Wool- 
wich in the years 1783, gory and 178 aber by order*of the 
a oe ond,. atin, ma 
1. The seocies with which balls are projeéted b fis 
der, en ss of the fame weight and 
velocities a sifferent charges of powder, the 
weight and length of the gun being the a 
“© 3. The greatéft velocity ue to the different Ten 
of guns, to be obtained Pte ce 
pie pe eee is capable 
fe of eying weight of the piece, every 
. ing “hep tion Scorer | 
6. anges times o cas toad to compare 
Sen esc: etes ni g th refiflance 
will be found that - 
oo 
'_of different pofitions of the vent 
of chambers an trunnions, oat ty other circum. 
ftance neceflary to be known for he improve ‘ment 
of artillery. 
All thefe objeéts were obtained in a very perfed and 
accurate manner 5 excepting only the article ofrange 8, whee 
were not quite 6 regular and uniform as right he tee 
The ba a too, were moft of them of one pound wei a 
wder was increafed from one ounce, up ti ‘the 
bore was quite full; and the pendulum was from 600 to 
pid ah eight. The conclufions from the whole were as 
fo 
‘1. That the former law, betwen the charge and ae 
of ball, is again confirmed, viz. that the velocity is direily 
as the “Toiiare root of the weight of powder, as far as to 
about the charge of eight ounces : and fo it would conta 
for all charges, were the guns of an indefinite length. 
as ae len Ee oF the i 
dye 
portion. 
gt = That the ane of the ball increafes with the c charge 
to a certain Paiitty which is peculiar to each gun, where 
it hia ‘anes the “qite Kil 
- Tasre of cme producing the greateft 
Z ; 4 j ‘i : : ae ? wae 
Gun. | Length of | Length | Part-of the | Wt. ofthe} 
Num, the bore. filled. | whole. , ’ powder. |. 
inches, inches. | se o7 
1 28.2 8.2 a 3% 64 
2 38.1 905 e< 14 
5b ee.) Od Ls ee 16 
Mh 79-9" 12.1 "ie 18 
“ 3. It appears that the wins etaaty a 
the gun is ge mee the increafe in Ee 1s “but 
very {mall i in refy ae in a length, the velocities 
being in a ratio pera lefs than that of the {quare roots 
of the length of the bore, but Serta greater than that 
of the cube roots of the Ten ngth, 
mre ratio | the t 
“<4. T ge increafes ina ‘much lefs 
eee and i wadeed 3 is nearly as the fquare Stee of the he 
pa y> the gun and etic Nein ie Tauare. And: when 
atte dali, 0. eloci d leng 
pai escaletos > 
this is , n of the velocity and 1 
little is spate in the ran reat ETenie 
of the gun, A 
eee 
aise Lee d indeed. the 
ore si EL fifth Toot of Bie agit af the bore 5 
SA ae ee 
