Report of the Judges of Implements at Norwich. 557 
are driven and evenly cut by the contact ; the two rollers are 
of equal diameter and length running parallel with each other ; 
one of the rollers is carried on a weighted lever admitting of 
lateral play in case of any hard substance intervening, and so 
prevents any damage to the rollers. By simply removing the 
knife the mill is converted into an oat crusher. Another 
important feature is that it is fitted with a shaker feed, which 
prevents any possible choke to the rollers, since the speed of 
the rollers determines the quantity of feed. This introduction 
of the knife-blade certainly assists greatly the cutting or bruising 
of any soft corn. The crusher is strong in all its parts, but 
rather massive, which has tended to enhance its price, 17/. lO*. 
Messrs. Marshall and Sons, No. 3909, Traction Engine. — 
On an eight-horse-power traction-engine Messrs. Marshall 
exhibited a pair of new patent spring driving-wheels. It is 
claimed for them that they are simple, efficient, and durable 
spring-wheels for traction and other purposes. The wheels are 
6 feet in diameter by 1 6-inch face. The rim is made of 2 
f-iron rings, 8 inches by 6 inches deep, to which catch steel 
brackets are riveted, the brackets having holes to take the pins 
which pass through the ends of the 'spokes ; similar preparation 
is made in the boss of the wheel for taking the pins for the 
other end of the spokes. The spokes are curved, with an eye 
at each end. 
The connection between the boss arid the rim of the wheel is 
made by threading two spokes on one of the pins in the boss, 
the spokes being placed in opposite directions, and connected 
by means of pins through the eyes at the other end of the spokes 
to the brackets riveted to the rim of the wheel. 
These spring-spokes merely carry the weight of the engine, 
the rim of the wheel being driven by two fixed arms connected 
to the rim by means of a drag-link. 
The arrangement does away with all nuts, and offers every 
facility for taking out an old spoke and putting in a new one. 
Messrs. Henri/ Bamford and Sons, No. 2949, Grinding Mill. 
— The most noticeable feature in this mill consists in its having 
reversible conical grinding plates, cut on both sides, so that 
when the pair of plates are worn out on one side they can be 
reversed. These plates appeared to be inexpensive, and on 
enquiry we were told that their price was \bs. per pair. The 
position of the grinding parts is arranged outside, so as to be 
got at without disturbing the shafts or bearings ; the cover can 
be removed by slackening four bolts, and the plates then got 
at and reversed with the least trouble, and, fitting as they do 
into turned recesses, no packing is needed. After the corn is 
ground, the revolving disc elevates it to a spout, at the required 
