534 Report of the Judges of Implements at Norwich. 
screening surface, and to any extent or degree required between 
its minimum and maximum mesh, this being dependent upon 
the diametrical or radial extent of distension or collapse given 
to the cradle, and to secure that the wires of the screen and of 
the cradle occupy parallel and concentric positions about the 
centre of rotation of the screen irrespective of their several relative 
distances apart. It is essential to the invention that the wires 
of the cradle should always occupy a position exactly bisecting 
the spaces between the wires of the screen, so that whether the 
spaces between the wires of the latter be equidistant, or vary 
throughout the length of the screen, the mesh at any one time and 
at any one position of the cradle may be the same, or gradually 
Figs. 7 and 8. — Ulustratincj Positions of Wires in Bainforth and'^Sons^ 
Corn-screen. 
ric.7. 
and equally increasing throughout the length of the whole screen- 
ing surface. This result may be obtained either by varying the 
wires of the screen alone, or by correspondingly varying the 
wires of the cradle alone." This screen (No. 762), to which was 
awarded a silver medal, was an 18 in. by 4 ft. 6 in. length, 
priced ten guineas. By an examination of the figures it will 
be seen how exactly the screen and the cradle in requisite com- 
bination secure the purpose of the inventor. Fig. 2 represents 
Fig. 9. — Illustrating the Mounting of the Wires in Messrs. Hainforth 
and Sons' Corn-screen. 
in part a side or external view, and in part also a sectional or 
internal view of the screen. Fig. 3 represents an end view of 
the exit end of the screen, illustrating the position of the parts, 
when the cradle is in its innermost position, giving the 
smallest mesh between its wires and the wires of the screen. 
Fig. 4 represents a transverse section of the screen and cradle 
