FORCE 
; ‘onti- | Day’ 
-Foree. a Work. 
Tuppening a man’s “aition. to 
; b when he 
eal 24 miles hour,’ we 
have 73 “for his svar bee 
- city, .o4 (74 — v)? for the 
force exerted with any sihee ve- 
aah and .016 or — v)* for 
action in cafe; thus, 
ans the velocity is one mile an 
- hour, the action is 676 
When two miles -964 
Three 972 
our 784 
And when five 5 
And the force in a ftate of reft becomes 23, or about 70 
pounds; with a velocity of two miles, 36 pounds; with three, 
24 pounds; and with four, I 
It is obvious that in the extreme cafes this formula is in- 
accurate, but for moderate velocities it is probably 
tolerable approximation. 
Coulomb makes the maximum of e & when a man 
is appears to be too 
as the reatel wel “ight that can be raifed. 
one half. 
. Harriot afferts that his ae ich a horizontal motion, 
enables a ma o one- more work than the common 
pump with a vertical motion. 
' Porters carry . 0 300 pounds at the rate of 
aload of 150 pads each ; and it is faid that in Turkey 
there are porters who, by ftooping a carry: from 7co 
to ig pounds aie very low on their backs. 
moft advantageous we 
ren ae carry horizo aly is 111 pounds; or if he 
returns unladen, 1 wheel para men will do 
_Coul 
Performance of men by anes 
much more work as with hods. 
Fase Conti Day’s 
“nuance. | Work. 
A’ Man raifed by a rope and pulley 
25 pounds Fr. 220 feet Fr. in 
145”. Amontons. 
A man can raife, by a 
436] .145” 
ood com- 
875 875 
in 
> 
co 
Ls) 
Ravin fays, that a 
man raifedfeven cubic feet of j ~ 
water 114 feet in 1', for eight 
or 10 hours a day, by walk 
A nas gman weighing 135 pounds, 
om 200 
chairmen walk four miles an hour with 
ioht a a man of common 
Co 
Force. 
. nuatices | 
Bins and forwards on a _ 
lev Enc. Br. 837 753 
and carrying 30, raifed 9% cubic 
eet 11% feet high, for 10 hours| _ 
a day, without fatigue. o- “4 
1.106 - 
Wynne’ s machine enables a man to 
raife a fhead 20 feet in a 
minute 
Force of Horfes. 
Two horfes, attached to a plough 
on moderate gr ea exerted 
se a force * I ag mon- 
apie that 
ses went a Tittle more than two 
miles an hour, for eight hours. 
vA horfe eabiie he the greateft 
advanta age e line of di- 
rection is level wit ith his breaft ; | 
and he r 
200 coede. 25 miles 
for eight hours in the day 
With a force of 240 only fiz hours. 
ts 
> 
oo 
x= 
~~ 
& 
os 
ng 
oolb. Defaguliers. ~ § | 8.8 
The mean draught of four aired 
was 36 myriogrammes each, 
Regnier. This 
6° 
ecR momentary 
Suppofing the velocity twe feet 
i cond, the aétion would 
have been 15.88 
By means of pumps a-horfe can 
raife 250 hogfheads of water, 
10 feet high, inan hour. Smea- 
ton’s Reports. 
a: 64 a 
A horfe can in general draw no more up a fteep hill thar 
three men can carry, that is, from 450 to 750 pounds, but a 
ftrong horfe can draw 2000 pounds up a fteep hill, which is 
but fhort. The worlt way of applying the force of a horfe, 
is to arry or hill: for, if thie, hill be 
fteep, three men will do more cian a horfe, each man climb- 
leaft force : 
body affifts by way oe ain Defagu 
he diameter of for a herfe-mill ought to be at 
leaft 25 or 30 feet. ulier: 
Some horfes have carried S56 or 700 pounds, feven or 
F2 eight 
