THE EXHIBITION OE 1862. 
415 
of the arrow, and the workman seated, as at g, the pinion / is free, 
and the pinion e in gear for driving the drum b more rapidly than a 
is turned by the rope c, and the seat at the other end of the plough 
is in the position h. On the return journey the ploughman sits upon 
the seat h, throwing the pinion e out of gear, and allowing the 
pinion / to drop into gear by its spring-clutch. In order to show 
the principle of this implement clearly, many details have been 
omitted, and the exact proportion of parts has not been strictly 
preserved. 
Fig. 4. Here suppose the rope proceeding from the plough to take one and a 
quarter turn round the first barrel of the windlass attached to the 
engine, and another one and a quarter turn round the second, 
before passing in a straight line to the anchorage at the other side 
of the field, embracing the large grooved wheel there, and finding 
its way to the back of the plough from which it started. 
Fig. 5. a is the drum mounted beneath the boiler ; b and b 2 are loose grooved 
wheels or sheaves placed on either side merely to lead the rope 
round. The rope x will be found to take a three-quarter turn 
round a, a half- turn round b, a half- turn round 6 2 , and another 
three-quarters turn round a before striking off at s to the anchorage 
at the other side of the field. 
Fig. 7. The “ clip drum” is here shown beneath the boiler of the engine, 
fitted with internal teeth, and driven by spindle and pinion which 
are perpendicular to it. The barrel beneath is to carry any odd 
lengths of rope. The construction of the drum is further shown by — 
Fig. 8. Which represents a section, a and b are portions of the upper and 
lower flanges, which can be adjusted to different distances apart by 
bolts and nuts, as at c ; eld represent a pair of the clipping pieces 
hinged on to the respective flanges ; the rope e is taken between 
them, and by its even pressure inwards causes itself to be nipped. 
