Report of the Judges of Implements at Norwich. 
559 
a small lever on the outside of the casing round the knife- 
wheel, the said plate of files is pressed up to the back of the 
knife onto the cutting edge; these files on the back of the knife, 
which we doubted being capable to produce an edge, on trial 
really did produce a keen edge as if filed up by hand, and laid 
as well on the steel mouth. To accomplish this sharpening the 
machine had to be driven somewhat slower for a few revolu- 
tions. The cutter also is fitted with a new patent automaton 
feeder, which dispenses with manual labour, the danger of 
which is somewhat great. The price of this chaff-cutter is 69/. 
Mr. William Bone, No. 574, Grain Separator. — The speciality 
of this machine consists chiefly of an inclined flat surface, 
called the separating surface, covered with cells, having a 
double motion imparted to it by means of a very simple but 
ingenious mechanism. 
The flat moving surface above mentioned is composed of 
narrow strips of wood, indented with cells on the upper surface, 
each one being covered with zinc to increase its durability ; 
the cells, when clear, are sufficiently large to contain cockle 
seed, hariff", broken barley, or any other substance smaller 
than the grain, but not large enough to hold any perfect 
grains. The strips are attached to an endless band, moving on 
pulleys, thus giving to the separator's inclined surface a constant 
motion in one direction from its lower to its upper end. The 
other motion imparted to the separating surface is of a recipro- 
cating and sifting character. The grain to be cleaned is 
delivered from the hopper on to the upper end of the separating 
surface, which, being inclined, and having a sifting motion, 
causes the grain to work down over its cellular surface to a 
spout at its lower end. The grain in thus passing over the 
separating surface leaves the seeds, broken grains, &c., behind, 
having fallen into the cells already referred to. The upward 
motion of the cellular surface carries the refuse with it, and 
delivers it at the end of the machine farthest from the clean corn. 
Messrs. Murton and Turner, No. 2612, Spider. — This article 
attached to a plough was rather novel ; but the makers assured 
us that in practice it fully bore out their representation. Withoirt 
the opportunity of a trial, we accepted their remarks, and re- 
ceived the following particulars respecting the implement. 
The " Spider Plough," is a piece of mechanism which, attached 
to the right or furrow side of the plough, performs the operation 
of harrowing the turned-up soil, and of throwing all the grass 
and weeds on to the surface, which is at the same time levelled, 
thus saving the labour of horses and harrowing. The inventor 
of this implement is Mr. C. Barker, agent to Sir R. Buxton, 
Bart., and it is in constant use upon the home farm, while 
