560 Report of the Judges of Implements at Norwich. 
many are in use in that neighbourhood. It consists primarily 
of two circular flattened rims, two feet in diameter, between 
Avhich any number of teeth can be inserted at intervals, and 
held firmly by screws and nuts ; these rims are supported upon 
eight spokes fixed in a hob which works on an iron axle with 
a five-inch bearing. The long teeth fixed in the rims curve 
outwardly about five inches, and thus the implement gives 
somewhat the appearance of its name ; the axle of the " spider" 
is inserted in a patent slotted lever, which is fastened to and 
adjustable upon an iron rod fixed behind the body of the plough. 
At the other end of the lever, which is about 3 ft. 3 in. long, is 
a hole through which runs a chain, one of which is fixed to the 
beam, and the other to the tail of the plough ; when fixed, the 
" spider " hangs at an angle of 35 degrees on the furrow side. 
Fig. 2b.— Messrs. Murton and Turner's " Spider Plough" No. 2612. 
By means of a slot into which the lever is fixed into the 
iron rod, the implement can be adjusted to the work ; no other 
motive power is required than that necessary for the plough. 
By the motion of the plough the " spider " is made to revolve 
by the obstruction of the clods, which it catches in its teeth and 
breaks up, and exposes the roots of grass on the surface. It 
may be a useful attachment to a plough on light soils, I 
should somewhat doubt its efficacy on strong land. 
Messrs. Thomas Corhc.tt, No. 1607, Chaff Cutter and Elevator. 
— This combined chaff and ensilage cutter and elevator consists 
of one of Mr. Corbett's " Dirri " chaff cutters on wooden frames, 
the fly-wheel having three knives, the gear-wheels being entirely 
of new design ; the cheek and mouthpiece of the machine 
are supported on a strong girder of wrought iron placed on 
