Report on the Trials of Implements at Oxford. 505 
or as a fixture, from 210?. in the former case to 1!)0?. in the latter ; has 2 sets of 
rollers, each roller composed of alternate rinQ;s of teeth, and bands or washers 
which slide on to the barrel fixed with bolts and nuts, so as to be readily 
replaced when worn down or in case of accident. The teeth are wrought iron, 
case hardened. In the upper rollers f inch wide with spaces between. In 
the lower rollers s inch wide with -p spaces. In order that the rollers may be 
kept clean, iron pickers are fixed on the frame, and act between the teeth. There 
is a friction sheave provided, which prevents accident from the presence of iron 
or stones. The bones after passing through the rollers are received by a 
revolving screen, which has 3 dimensions of mesh, and removes everything 
but the very coarse and partially broken bones, which can be carried up to the 
rollers and re-crushed. An additional 10?. will do this. Every kind of bone 
can be dealt with. The Judges awarded a prize of 9?. 
The machine No. 1505, exhibited by the same firm, is smaller. A self- 
feeding apparatus is attached, consisting of 2 revolving chains in a box. We 
did not see much merit in this, as owing to the irregular character of the 
bones the attendant had quite as much work as he would have had with an 
ordinary mill. The j^rice (95?.) includes friction sheaves and self-feeding 
apparatus. This mill lias only one pair of rollers similar to the lower pair in 
the larger machine. It is very strongly made and capable of doing a quantity 
of work ; the revolving screen is fitted with 3 different sized meshes — viz., 
■|, f, and if inch. It was noticeable that, although provided with only half 
the grinding surface of the larger mill, the difference in the quantity of tail was 
not gi'eat, and hence it would appear that this machine will be found most suit- 
able for a farmer's or small manufacturer's purpose. We do not, however, think it 
would answer for a farmer to buy raw bones, and make his own superphosphate ; 
the manufacturer gets an equal result with far cheaper materials. Prize of 6?. 
Crosskill and Sons. No. 623. Price, 90?.— Kesemblcs the last closely. We 
noticed with satisfaction that the gearing is well guarded. The rollers are the 
same width, by 14 inches. The revolving screen is somewhat shorter, making 
only two samples, i inch and ^ inch, and set at a greater incline, which may 
account for the difference obtained in the comparative trial. Prize of 5?. 
No. of 
Catalogue. 
Ilaw 
Dones. 
Three- 
eighths. 
Five- 
eighths. 
Thirteen- 
sixteenths. 
Refuse. 
Power. 
cwts. 
lbs. 
lbs. 
lbs. 
lbs. 
1505 
Beverley Iron Company 
3 
51 
89 
109* 
86^ 
19,500 
One- 
Seven- 
half. 
eighths. 
623 
Crosskill and Sons 
3 
46 
138 
152 
18,750 
A third entry, No. 1506, of the Beverley Company deserves recognition, on 
account of its moderate price, and a reciprocating screen capable of separating ^ 
and f inch bones. No. 1507. — A still cheaper mill, costing only 50?. The teeth 
are a shade smaller, and the width of the box less. It will not grind the largest 
bones, but otherwise is a very useful machine. The screen moves more rapidly 
than in the others, and consequently a better sample is made. 
Mr. James's mill, No. 5486, is on a much smaller scale, costs 22?. 2s. with 
screen complete, and consists of two pairs of deeply fluted rollers of cast iron ; 
each pair driven by a separate pulley and at different speeds. Th§ fluted rollers 
are not adapted to deal with raw bones, and would soon choke, although it is 
possible that with bones boiled or steamed they would work well. 
Mr. James's second article exhibited was just the same in principle, only on 
a still smaller scale, and with one pair of rollers only. As the bones have to 
pass through the mill a second time, the coarser roller is exchanged for a finer 
one, and thus a tolerably fine sample should be made. 
