498 Report on the Trials of Implements at Wolverhampton. 
transporting tlie apparatus with- 
out horses, is fitted with a fly- 
wheel or rigger, having a deep 
V-groovo suitable for receiving 
a Manilla hemp rope of -| or 
f inch diameter. This rope is 
led a three-quarter turn round 
the fly-wheel by means of a 
guide-pulley, B, which is tem- 
porarily attached upon the engine 
fore-carriage ; or, if the engine 
has its fly-wheel at the other 
end, this pulley is supported by 
a bracket strutting from the 
firebox. Any portable engine 
can be fitted with a large grooved 
rigger and the smaller guide- 
pulley, both made to take off and 
on in a few minutes. The rope 
is completely su]iported, at a 
height of 3 feet 9 inches above 
the ground, upon a number of 
light friction-rollers, or grooved 
pulleys, secured in a very simple 
manner to wooden stakes, C, 
which are driven upright into 
the ground at intervals all round 
the field or plot to be worked. 
The angles are turned over larger 
pulleys, D, mounted upon light 
two-wheeled carriages or bar- 
rows, each being held in position 
by a couple of short chains fas- 
tened to ironstakes in the ground. 
As the weight of the Manilla 
hemp rope is only 6 to 8 ounces 
per yard, and as the strain upon 
it when driven by a 10-horse 
engine is only between 3 and 4: 
cwts., the pressure upon the fixed 
rope-porters and upon the pul- 
lej's of the corner anchors is com- 
paratively small ; and hence, so 
long as the bearings are kept in 
order, the friction, notwithstand- 
ing the high speed of 30 up to 40 
miles per hour, is not excessively 
great. It is not necessary to 
place the engine in the same field 
as the cultivating machinery ; 
and at Stafford one of the trials 
was made with the engine sta- 
tioned 200 yards from the plot, 
for the purpose of letting it draw 
its water from a stream which 
happened to be near. The out- 
going ply of rope (the rope 
running always in one direction) 
