Report on Implemerds at Preston. 
699 
to different whippletrees. In his second entry (No. 2441) 
Mr. Corbetc employed two sets of the tubular iron trees ex- 
hibited by him as No. 2436 in Class IV., the pomel-tree_of 
Fig. IQ.—JSlr. T. Corhetfs Four-horse Wluppleiree, No. 2440. 
the leaders being attached by a long chain to the centre of the 
hinder pomel-tree. There is no equalisation of draught between 
the leaders and the hind pair in this arrangement ; a still more 
serious objection is that, in turning on the headlands, great care 
is needed to prevent accidents from the long chain and the 
three trees hanging in front of the hind horses. 
In Ransomes, Sims, and Jefferies' entry (No. 4340), they first 
used six trees in the same way as Corbett did in his second 
entry, but with the addition of a chain and pulley to equalise 
the draught. Here again the knees of the hind horses are 
in great peril in turning. Before their trial was ended they 
removed the chain and pulley and one set of trees, and finished 
their work by taking all the draught through the traces direct 
on to one set of whippletrees. The trees are probably strong 
enough to stand the strain under ordinary circumstances, but 
there is, of course, no equalisation of draught between the front 
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