554 Report of the Judges of Implements at Norwich. 
Messrs. Harrison, McGregor, and Co., No. 64, Knife Sharpener. 
— The patent Grinder and Sharpener introduced by this firm is 
designed for dispensing with the use of the file for sharpening 
reaping and mowing knives, sections, and fingers, which by this 
machine is effected by the use of a small emery-wheel ; it is 
also available for sharpening finger or finger-plates. 
The frame of the machine consists of two parallel tubes 
secured to end plates, and mounted on angle-iron legs with 
stays carrying a fly-wheel and foot-treadle. On the parallel 
tubes is a sliding cross-piece, having a vertical swivel-fork, 
with a horizontal cross-shaft, carrying a grooved pulley and 
friction bevel-wheel, motion being communicated by a cord 
from the fly-wheel to the grooved pulley. On this same cross- 
shaft is hinged a moveable frame, which carries the grinding 
apparatus consisting of a spindle, having at one end a small 
emery-wheel, and at the other an india-rubber bevel-pinion 
which is driven by frictional contact with the bevel-wheel. 
By means of a handle attached to the moveable frame, the 
emery-wheel can be moved into any desired position, up or 
down, backwards or forwards, or sideways, the arrangement 
of sliding cross-piece, swivel-foot, and hinged moveable frame, 
admitting of a complete universal movement to the emery- 
wheel. When a knife is to be operated upon, it is secured on 
a rest at the forward end of the fixed frame, at right angles to 
the parallel tubes, and with its back to the operator. 
A simple arrangement admits of shifting the knife endways, 
so as to bring any desired part into position to be operated 
upon ; an adjustable pin maintains the grinding apparatus at 
the desired level to give the proper bevel to the cutting edge of 
the knife section, and an auxiliary lever is placed conveniently 
to the operator's left hand, to enable him to move the grinding 
apparatus easily backwards and forwards ; while with the other 
handle he gives a gentle pressure sideways, so as to cause the 
emery-wheel to follow the angle of the section during the back- 
ward and forward movement. For grinding fingers, the finger- 
bar is secured so that the emery-wheel may be adjusted to come 
between the fingers and the desired level for giving the slight 
bevel required for the cutting edge of the finger-plates. The 
grinding apparatus is then moved backwards and forwards, 
cither by means of the lever before mentioned, or simply 
by the handle on the moveable frame, the operator at the same 
time giving the necessary side pressure. For sharpening the 
points of the fingers, the level adjustment is removed; and the 
grinding-wheel is carried around the point of the finger in any 
desired position. 
Mr. Thomas T. Mayo, No. 1814, Bolting Tier.— The machine 
