FORGE 
te fuereafe or diminution a by any fuch variation in the mode 
of its applicat 
Since we pa % means of any mechanic mage ees ng 
“6 ‘a vis motrin exerted ionek a given /pace otion 
to a body for the 2 ce of e a ying its ie fer the 
‘produdtion of any fu fudden effe&t,’ or can,.on the contrary, 
Se amoving body _ afcend, and thus refolve its im- 
s into a moving force, ready | to exert itfelf through a 
Getenaiuee fpace of defcent f producing pre- 
"force depending on impetus may juftly be faid to be o 
‘fame kind as any other mechanic force, and they may be 
frilly compared as to quantity. In this manner we ma 
" even compare the force of bodies in motion to the fame kind 
of force contained ina given quantity of gun-powder, and 
‘may fay, that we have the fame quantity of a force 
at command, whether we have one pound of pow which 
could give 
cient to raife it through forty feet, or the, weight actually 
dy 
icin to that height, and fing ite to be let down gradually, 
' more horfes may have performed in a da ay ga being ex- 
preffed by the {pace through which a given moving force 
g 
’ exerted. Inthe cafe of animal exertion, howeres confiderable 
" uncertainty tla ha prevails, in confequence of the unequal 
he fam 
‘ 
ractic 
"is always the fame; and is proportional to the [pace ae 
owers sah animal s of th e {pecies, a varying vigour of 
ie fame animal. Th e information which the author of this 
aper ine pacer y in reply to inquiries refpe€ting the 
P 
weights raifed in one hour by horfesin different fituations, has 
varied as far as from fix to fifteen tons to the height o one 
is the fame, in whatever time it may have been performed. 
In fhort, whether we are confidering the fources of extend- 
~ ed exertion'or of accumulate edenergy, whether we compare 
‘the accumulated forces themfelves by their a“ or by 
~ their fudden efforts, the idea of mechanic force in pra 
uare 
"of the velocity ofa body in which fuch force is acc omlated. 
Comparative table of mechanical shadeds extradle : 
cond, for 10 hours ina day; or to raife an 100 be 
in 
a fecond, or 36,000 feet in a day ; or '32000,000 pounds, or 
432,000 gallons, 1 foot in a day. ‘This we may call a 
oo", 
i mmediate force of men, without dedufion for friGion. 
. . Forces | soaton, | Werk 
A man, weighing 133 pounds - 
afcended 62 feet Fr. by fteps i 
34", but was. Sheela er 
-ed. Amo ; 2.8 34" 
A fawyer made 200 ftrokes of 18 
not have beeps on above 3 mi- 
nutes. Amontons. 
man can rife 6 pounds Fr. 1 
oot Fr. in 1 for 8 hours a 
day. Bernouilli. 
6 
A man of ordinary ftrength can 
turn a winch with a force 
30 pounds, and with a velocity 
of 34 feet in 1", for 10 hours 
a day. Defaguliers 
Two men, working at a windlafs 
can raife 70 pounds more eafi- 
ly than one can raife 30, De- 
faguliers. 
I 
man can exert a force of 40! 
for a whole day, with 
as 
pb 
: 
bd 
[=] 
& 
rh 
c 
3 
ec 
> 
co 
pub} 
i= 
—) 
3 
or 
~ 
2 
ct 
rs) 
3 
it appears to be doubtful whe- 
ther the force is 49 pounds or 
For a fhort time a man may ex- 
ert a force o 
a fly, ‘* when the moti 
u b 
n: going up ftairs for a day 
ie 205 chili chogeatines to the 
pean of a chiliometre. Cou- 
b 
With a {fpade a man does 32 as 
aa as in afcending ftairs. Cou- 
With a winch a man does 3 as 
much as in aco Hairs, 
Coulomb. 
man carrying wood up ftairs 
raifes, together with his own 
weight, — chiliogrammes to 
Co : 
1 chiliom ou 
ds F. 
can afcend by flairs 3 feet 
Fr. in 1” for 15" or 20/, Cou- 
! 
n) 
For half an hour, 100 pounds Fr. 
may be raifed 1 foot Fr. in 1", 
Coulomb 
According to Mr. Buchanan’s 
a the force exerted 
n turning a winch. being made 
cl to the unit, ‘the orce in 
7pumping will be 
a ringi 
owing 
Allowing the’ accuracy of Euler's 
fora con firmed by Schulze, 
| Conti- Day’ ce. 
Force. nuation. Work. 
14s! 
Sn 552 
o5 | 10" | 10g 
22 1.22 
. 2 
3. uf 
1.182} 4. 
41Z 
“$93 
+258 
1219 
5.22" 20" 
1.152) 30! 
61 
1.36 
1.43 
} ' 
. fuppofing 
