472 Report on the Trials of Implements at Cardiff. 
or revolves beneath the grain ; in this case the power is] all expended npon 
moving the cleaning collars, and the pitch of the screen is of necessity made so 
sharp, that the barley falls rapidly down over the surface by its o^vn weight. 
But little of the tail-corn was extracted. There is, of course, no absolute 
saving of manual labour in using such a machine for com lying on the bam 
floor ; the power that moves the collars must be first expended by the man 
who lifts the com an extra foot high in filling the hopper. If he lifted the 
com 16 feet higher, there would be power enough to move the screen itself, 
and by suitable mechanical contrivances the work might be done thoroughly, 
but the man would be doing double work. The only case in which such a 
machine seems likely to be useful is where the grain to be screened lies on aa 
upper floor, and a sufiicient fall can be obtained without extra labour : even 
there, an overshot or a breast-wheel to utilize a fall approaching 16 feet would 
e far too cumbersome to be suitable for the smill weight of the grain. A tur- 
bine-wheel is well suited to utilize a small fall of water in similar cases, and 
might perhaps be employed economically for grain in large granaries. 
Ko. 925. TJiomas Corlett. — This machine was fitted with a blower to remove 
L'ght substances fi'om the com as it passes from the hopper to the screen, but 
by the direction of the Judzes tne mouth of the fan-box was nailed up during 
trial. The soreLn is flat, and composed ot small wires woven to form a square 
mesh ; it is suspended upon slings, and can be raised or depressed at its lower 
end. By thus altering tne pitch ot the screen, the grain passes more or less 
quickly over its surface. It is made to oscillate by two coonecting-rods, driven 
by crank-wheels upon the fan-shaft. A long-handled bmsh, of the full breadth 
of the screen, is worked by hand up and down its underside. This brush 
worked stit3y, and required a better metl.od of attachment to the handle. 
Ko. 4617. Somsby and Sons. — The screen is fitted with a blowing appa- 
ratus ; but it was not used in the trial, and the machine consisted simply of 
the hopper and the cylinder of coiled wire, with a small stone separator at 
its upper end. The grain falls from the hopper first into the stone separator, 
a wire cage with coarse meshes revolving with the screen : an Aitihimedeaii 
screw ot sheet-tin carries the stones backwards and upwards and delivers 
them through a spout at the back. The screen is a cylinder of coiled ^vire, 
wrapped round a frame composed of light iron rods, arranged diagonally, 
and terminating in the rims of two castings carried upon a central shaft. The 
coiled outer wires are bound by wire stitching to the diagonal rods, and, 
by a recent improvement, a loop of the stitching-wire is introduced between 
each ot the main wires of the screen, thus wedging them apart and pre- 
venting them from slipping upon the rods. The screen is adjusted by a 
handle on tte end of the central shaft. This handle moves the low er casting 
up or down a slot on the upper side of the hollow shaft, by means of a screw 
insiJc the shaft. ITie casting that forms the upper end of the cylinder is free 
to revolve between two collars upon the shaft. Thus, when the handle is 
turned to set the screen closer, the lower casting slides up the shaft and the 
tinper casting is pushed by the thrust of the diagonal bars, so as to turn over 
from left to right. "When this screen was first brought out the passage of the 
grain was regulated by the action of the diagonal bars only, but the screeo 
brought for trial w;ls fitted with a large sheet-iron Archimedian screw, similar 
to tiiosc used in mtst other rc tary screens. The exterior of the cylinder is a 
plain surface, the spoces between, the wires are kept free from obstractlons by 
a long brash resting upon the upper side of the screen, and hinged upon the 
outer frame. 
Nos. 2291 and 2292. Pmncy and Co. — The screens made by this fimi have 
loiu been poi ular with the manufacturers of threshing-machines, and were 
more used than any other in the threshers entered for trial. 
lu each of these screens the cylinder is formed of a continuous coil of iroa 
