706 
Report on Implements at Preston. 
wanted, and has now been invented by Messrs. Rain forth and 
Sons. The longitudinal bar that runs down the centre of the 
screen is fixed upon the frame ; the parallel rods with the 
bars that form the sides of the screen can be drawn towards the 
centre bar to make the meshes fine, or spread from it to make 
them coarse, by the working of a lever fitted on the underneath 
side of the top of the screen, and not shown in the drawing. 
The bars and rods are kept parallel with each other by the 
links that are seen traversing: the face of the screen. There 
are six holes in each rod, and corresponding holes in the 
links above it ; studs are passed loosely through these holes ; 
a shoulder on the stud keeps the link raised a little above the 
rods of the screen. These rivets and shoulders are shown at 
the top of Fig. 15 ; they are introduced in order to keep the 
links clear of a series of washers that run between the bars and 
keep the entire length of the screening-surface clean. These 
washers are strung on rods fixed transversely on to the fixed 
bed under the oscillating screen. In Figs. 15 and 16, kindly 
Eigs. 15 and 16. — Details of Messrs. Hainfortli and Sons' Corn-screen. 
Fig. 15. Fig. 16. 
supplied by the editor of ' Engineering,' in whose issue of 
July 24 a description of the screen appeared, the relative position 
of these washers between the screen rods with the connectinff 
links passing over them is shown in detail, it being a special 
feature of merit in this screen that corn cannot remain lodged 
in any part of it. It will be seen that, as the links assume a 
more or less oblique position, so the rods of the screen are set 
closer or wider apart. The screen can be adjusted to dress 
grain varying in size from rye to beans. 
In our first trial the screen was set close, and a bushel of 
thin grinding barley was run througli in 1 minute and 10 seconds. 
It was then set wider, and tested with corn obtained by mixing 
the best of this thin barley with a larger quantity of a good 
malting quality. In each trial the barley descended in a thin 
and even stream ; the rippling action caused by the grain 
passing over the connecting links changed the position of each 
