'Report of the Trials of Ploughs, Harrows, Sfc, at Hull. 551 
Fig. 29. — Central Section of Socket in Fig. "dO.— Frame 
Fisons Double-furrow Plough. Attachment. 
a. Beam, b b. Split frames. 
Murray and Co. No. 3502. — This is a strong useful implement, composed 
of wrought iron and steel, castings being almost entirely dispensed with. The 
beams are 2^ inches deep by ^ inch wide, and 2i inches by |- inch, and expand 
from 6 to 15 inches, being regulated by two screws and one wedge. The lifting 
arrangement is different from that in the light-land plongh, and, as will be seen 
by reference to Figs. 31 and 32, p. 552, is both original and simi)le. Attached 
to the beam by a simple clip and pin is a stud with a crank bearing welded 
to it. Upon this stud the lever works with a slipping wedge belo'w, which 
rests upon the crank-bearings ; a rod from the wedge extends back to the 
ploughman's band, and terminates with a catch near the end of the lever. A 
number of holes in the lever and a similar hole in the catch allow of the rod 
being fixed by a pin in any jjosition requisite to keep the wedge in its required 
place, according to the depth required ; or of its being thrown up altogether, 
when the wedge slips in and keeps the plough out of the ground by bringing 
the land-wheel more backward and more nearly into a vertical position. The 
great merit of this arrangement is simplicity. There is nothing to get out 
of order ; let the plough be ever so roughly used, the leverage or lifting ap- 
paratus cannot be injured. Another considerable advantage of the lever stud 
and bearings is that they are all contained in one piece, and held to the beam 
by a simple pin, which can be knocked out, and the whole affair, including 
the land-wheel, shifted backwards or forwards, as may be required. A central 
wheel is held to be a disadvantage, placing the plough too much upon the 
balance. Here we can put it in whatever position experience proves to be 
best. Sometliing will depend upon the nature of the land to be dealt M'ith. 
In wet clay-land, at any rate, the wheel should be in a forward position ; in 
dry soils, where tlie bottom is hard and the plough has a tendency to run 
out, a backward position is held to be best. Murray's arrangement allows 
of alteration, and this is a point of considerable merit. The draught is taken 
from the cock, which appears to be a mistake. In work, possibly owing to 
the too central position of the land-side wheel, the plongh was not steady ; 
though an improvement on the work of the lighter plough ; and the bottom 
