Report of the Trials of Ploughs, Harrows, Sfc, at Hull. 595 
the nuts shown cat c anil d, Fi<i. 100, which hold the catch in its place on the 
guide, and raise it a little higher and fix the nuts. It will be seen from 
Fig. 99.— C. Clays Cultivator and Broadshare, No. 479. 
Fig. 100. 
Patent movable 
Catch. 
the illustrations that the leverage is required to keep the tines in the ground, 
and it is a question whether this is so good a plan as the opposite, where the 
position of the tines ensures their entering into work, 
and the leverage is exerted in order to raise the tines at 
the land's-end ; in the one case we have the strain of the 
leverage during work, which should be very much the 
longer period, in the other only when out of the ground. 
Still the ability to relieve itself when choked is a great and 
counterbalancing advantage ; moreover, the form of the 
tines facilitates the action of the lever, for when the move- 
ment of the bar brings the weight over the centre of gravity 
the weight of the tines themselves completes the required 
movement, and all that is necessary on the part of the 
attendant is to steady the descent of the handle and place 
the same in the catch. 
In Fig. 99 two coupling hooks are shown. The object 
of the lower one, marked c, is for fallow land ; by attaching 
the horses to it instead of the upper one, which is the 
proper attachment imder ordinary circumstances, the for- 
ward part of the frame is lifted, and the tendency to sink 
prevented. Various shares can be used, from narrow culti- 
vating points to square and V-shaped shares 12 inches wide. It will be seen 
by reference to the tables that Mr. Clay's position at the head of four classes 
was partly due to the favourable results of the dynamometric experiments. 
The character of the work being equal, that implement which takes the least 
powei' must be the best, provided it is sufficiently strong to resist the maxi- 
snum strain to which it can he liable in fair work. No doubt the Judges 
(vere satisfied on this point by the examination of the strength of material and 
workmanship : had they been in doubt, the report of the Judges at Leicester 
might have been usefully consulted. We venture to quote their words : 
" These implements were tried on a piece of tare stubble, from which the 
crop had been recently removed, and which was in a tolerably friable state 
on the surface, but exceedingly hard and tough below : so much so that only 
two out of the eighteen selected for trial were able to withstand the severity of 
the strain." Those two were Bentall's and Clay's, which were placed accordingly. 
VOL. IX. — S. S. 2 R 
