414 
Report on the Exhibition of Implements 
additional wheel. To judi^e by the machines exhibited at York, 
these latter expedients are in much greater favour with the makers 
than large horse- wheels, but there are serious objections to this 
mode of construction. Theoretically it is of no importance what 
combination of wheels is introduced between the horse-wheel and 
the drum, so that the requisite number of revolutions per minute 
is ultimately secured, but practically it is highly important that 
there should be as few separate movements as possible. Wherever 
an additional centre of motion is introduced, there will be addi- 
tional friction and vis inertice to contend with, both of which 
absorb power. The use of very small pinions is also highly 
objectionable. From these premises it will at once be perceived 
how desirable it is that the horse-wheel should be large, as the 
speed is thus maintained from the first ; whereas if this speed be 
lost in the first movement, it must be subsequently recovered, 
either by small pinions or additional wheels, the evils of which 
have been pointed out above. It is urged by the makers, that if 
the horse-wheels are large in travelling machines, they will not 
pass through ordinary gates, but a slight exercise of ingenuity 
would get over this difficulty. The more correct reason probably 
is, that small wheels are not so costly as large ones, and as the 
makers do not supply oats and beans for the horses, they are not 
so sensitive on the subject of increased draught as those who do. 
Corn-dressing Machines. 
NAME. 
Work. 
o 
.= 
B ^ 
Total Quantity Dressed. 
Total Men required. 
J= 
Art. 
Price. 
1 Time 
Lengl 
o 
Best 
Grain. 
Best 
Tail. 
Tail. 
Whiles. 
Screen- 
ings 
Driving 
Machine. 
Filling. 
Taking 
away. 
£. s. 
lu. 
B.p. q. 
P. q. 
P. 
Q. 
Q. 
24 
11 
R. Hohn^by, 
of Grantham. 
13 10 
2 4 
13 
66 
4 1 3 
1 4 
2 
4 
0 
1 
2 
A strong 
buy 
Same Machine, 
1-20 
43 
4 0 6 
0 3i 
2 
2 
1 
1 
1 
1 and a 
dressini; same 
h,.y 
grain second 
lime over. 
Judges'' Report. — " Several other machines were tried, but could 
not get through the grain, shorts, straws, and chaff, as it came 
from the thrashing-machines, without being choked or requiring 
much more time than Hornsby's, which did its work well ; 
parting the whole into best corn, good tail, tail, whites, screen- 
ings, and chaff, at the rate of above 15 quarters an hour, and 
dressing over the second time it did it at the rate of above 
20 quarters per hour, parting the whole into six parts, as before, 
in a workmanlike manner." 
Grinding-millsfor breaking agricultural produce into'fine meal. — 
