Report on Implements at Preston. 
697 
In Davey, Sleep, and Co.^s, No. 411, the outer bars draw from 
the ends of the pomel-tree, while the middle one is attached to 
a link connected at the ends of two equalising levers centred 
to the adjustable draught bar, and also to the pomel-tree. The 
length of this pomel-tree caused the attachment on the plough 
bridle to be too far to the left for the horse in the furrow, and 
the offside whippletree too far to the right. 
Fig. 7. — Messrs. Davey, Sleep, and Co.'s Tliree-horse Wliippletree, 
No. 411. 
In No. 413 the pomel-tree is shorter, and instead of the levers 
a partial pulley of 2 to 1 is employed. The middle-horse tree 
is attached to the top chain, and the pomel-tree to the lower 
Fig. 8. — Pulley in 3Iessrs. Davey, Sleep, and Co.'s Three-liorse 
Whippletree, No. 413. 
chain. The pulley in work stands on edge, and has a radius 
of 6 inches on the upper, and 3 inches on the lower half. The 
middle tree is thus higher than the others. 
In Kell, Meats, and Co.'s, No. 1367, we have tubular iron 
trees arranged like Brenton's, four of them tubular, and the fifth 
(apparently without much reason for the difference) a double 
bar of steel. These trees would have given a better draught if 
they had been a little shorter. 
Ransomes, No. 4340, was first worked three horses abreast, 
with five trees, four of them being the same as supplied for their 
two-horse set, and the fifth a strongly trussed, equalising and 
adjustable pomel-tree. Two of the minor trees were then laid 
aside, and the team was driven with one horse on the land, and 
two in the furrow. It will be noticed that the trees in the 
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