488 Report on the Trials of Implements at Oxford. 
cwi by a simple alteration of shaft. Three knives, which lap over each other, 
and two of which arc always cutting. Mr. Allcock fed the box himself. The 
feed rollers arc peculiar in Iiaving a double set of teeth, or more properly the 
intervals between the sets of iirojecting teeth are raised into small sections, 
and thus the rollers have a double action on the fodder ; whether it was this, 
or the excellence of management, the feed was very regular, and the sample 
■of chafi' particularly good. The quantity cut was only small. The mouth of 
the box is 13 in. wide, and the price 13?. 
Fig. 11. — H. MaynarcCs Patent Portable Steam-power Sifting Chaff" 
Engine, No. 3168. 
i?. Maynard, of Whittlosford Works, Cambridge, exhibited his Portable 
Steam-power Sifting Chaff-Engine, which is mtcnded to be used in con- 
junction with a portable thrashing machine to cut the straw, screen, and bag 
the chaff as fast as the straw comes from the machine. It is driven by a 
strap direct from the fly-wheel of the engine, the pulley, on knife shaft, being 
28 in. diameter, revolves 270 per minute, and as there are 5 knives we get 
1350 cuts in that time. The chaff as cut falls on to a sieve, which separates 
the cavings, unavoidable in a power machine ; these cavings are brought out 
-of the end of screen, and in one machine a caving elevator is provided by 
which they are returned to the box, incorporated witli the straw, and cut 
over again. The chaff, after passing through the riddle, falls into a shoot, 
which, being finely perforated, allows tlie dust to separate during the passage 
of the chaff to the elevator, on which a sack is hung to receive it. The 
Judges distinguished this machine, which they did not consider could come 
into competition, by awarding it a " Silver Medal." 
The importance of these simple machines, and the demand that must exist 
for them, was proved by the numbers competing for the ]irizes — no less 
than thirty in the two classes for hand labour and power. The growth of 
agriculture is indicated by this development. Linseed and other oilcakes 
occupy a prominent position as feeding materials extraneous to the farm, and 
although other substances have come into competition of late years, they still 
stand in the front rank. 
Section VI. — Oilcake BnEAKEES. 
