Report of the Judges of Implements at Norwich. 531 
slightly taper, consequently the more work there is put upon the 
pulley by the belt the tighter the bush grips the shaft. The 
bushes are in four parts, held together by a piece of stout emery 
cloth, thus forming a hinge at the joints, which enables the 
bush to be opened and placed upon the shaft (b), and adapts 
itself to the shaft (c). The bush is practically a four-hollow 
kerp threaded upon the outside, the pulley being screwed upon 
the kerp, instead of the kerp being driven into pulley. Fig. 1 
represents a pulley and bush on the shaft ready for fixing. 
The pulley has simply to be screwed on to it, without either 
kerp or key beds — the bush fits the shaft properly, and the 
pulley will run true. The advantages claimed by the patentees 
are these : first, the same pulley will fit any size shaft with 
merely an alteration of the bush, and can be changed if neces- 
sary from one shaft to another. This is a great convenience, 
and saving in mills and works where large numbers are used ; 
secondly, should the shaft vary either or under the standard 
sizes, the pulley will fit equally well, neither tools nor skilled 
workmen being required to fix it, and it cannot get loose in 
work. The pulleys are manufactured in cast-iron, and with 
steel rims. A specimen, 36 in. diameter by 24 in. wide, with 
double arms, was exhibited at Norwich, and reflected great 
credit upon the manufacturers ; we were also informed by the 
makers that, encouraged by success, they have erected special 
machinery for their manufacture, enabling them to be offered to 
the public at the same price as ordinary pulleys. To this article 
a silver medal was awarded. 
Messrs. William Rainfortti and Sons, No. 762, Corn Screen. 
— This, a rotary self-cleaning corn screen, is constructed upon 
quite a novel principle — a cylinder of wire revolving within a 
fixed wire concave or cradle. This screen is so constructed, 
that the fullest range of alteration of mesh can be obtained 
easily, and with the greatest degree of nicety to any size re- 
quired — simply by an angular movement of a handle. More- 
over, the extreme length of the screen can be used for screening 
purposes, irrespective of any alteration of mesh ; it is self- 
cleaning, and the need of brushes or any other cleaning con- 
trivance hitherto used is thus dispensed with. Messrs. Rainforth 
have kindly given the following descriptive account of the con- 
struction of this screen, and the principal improvements it 
presents, and the detailed engravings, well illustrate this descrip- 
tion : — " The improvements have special reference to self- 
cleaning screens, and consist essentially in combination with a 
rotary self-cleaning screen having a fixed mesh and a fixed 
length and diameter, with a stationary adjustable segmental 
"Cradle ; also having a fixed mesh and length, but capable of 
