500 Report on the Trials of Implements at Wolverhampton. 
s 
inches Icnpitli only in the upper groove ; hut this extent of bite or pinching 
of the roiie is found sufficient for transmitting the full power of a 12-horse 
engine. At the lower end of the 
vertical axis of the driving-rigger 
a pinion, D, engages with a spur- 
wheel E ; and the axis of this inter- 
mediate motion carries two pinions, 
one (not shown in the drawing) 
gearing with the spur-wheel, which 
is secured to the ro]3e-druni A, the 
other pinion, F, driving the small 
rojie-barrel G. The pinion U is- 
thrown in or out of gear by means 
of a friction-cone, H, which is 
tightened or loosened by the lever 
J and hand-wheel and screw K. 
The i^inion F is similarly put in or 
out of gear by a friction-cone, not 
represented in the sketch ; and the 
rope-drum A, being hung upon a 
stud or shaft which can be turned 
eccentrically, can be moved by the 
lever L so as to set the drum spur- 
wheel in or out of gear with the 
pinion on the axis of the inter- 
mediate spur-wheel E. When pay- 
ing-out the plough-rope M the 
drum is thus released, but its- 
motion is restricted and the rope 
held partially taut by means of a 
friction - strap round the upper 
flange of the drum ; this strap 
being caught and held by a palL 
and ratchet-teeth, which cause the 
brake to operate only when the 
drum is paying out rope. A radial 
arm, which swings round upon a 
swivel, carries a guide-roller for 
upholding the rope as it feeds on 
or runs off the drum ; but there 
is no coiling gear. The action is 
easily understood. Upon the im- 
plement arriving nearly at the 
windlass, the anchor-man instanta- 
neously releases the clutch H by 
the hand-wheel K, and then with- 
draws the drum out of gear by the 
lever L. The other anclior-nian, at 
the opposite end of the field, imme- 
diately upon finding the rope cease to pass off his windlass sets the drum in gear 
and screws his friction-clutch tight, and the implement begins its return journey 
without any delay. Thus, in the first trial at Barnhurst, the average time occu- 
l)ied at the ends was only 6 seconds, and frequently did not exceed 5 and some- 
times 4 seconds. While the windlass is paying out wire rope, it is made to 
advance for the required distance along the headland by putting the pinion F 
in gear, so as to wind slowly upon the barrel G the wire rope N which is fixed 
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a 
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