72 
Report on the Agricultural Implements at 
Corn Mills. — Messrs. Jaacks and Behrns, of Liibeck, ex- 
hibited a model of millstones with their patent aspirator, ' of 
which the following sketch and description will afford some 
idea. 
Fig. 59. — Messrs. Jaacks and Behrns' Patent Aspirator. 
D D. Flannel curtains. E. Vacuum metre. 
The object of the patentees is to obtain a thorough current of air between 
the stones, and at the same time to remove all moisture. The air, as will be 
seen by the direction of the arrows, enters from above, and, after circulating 
between the stones A A, is exhausted in the tube B. The flour is forced out on 
the opposite side by an endless screw, C, with a valve-mouth, so that no air can 
possibly enter. In order to prevent the flour passing into the exhaust, as it 
would inevitably do from the force of the current, the whole of the upper 
inner circumference is hung with triangular-shaped surfaces of flannel, on 
which the flour accumulates, and from which it is occasionally detached by 
an automatic vibration communicated to the flannel. The case surrounding 
the stones consists of wood and felt, lined with tin, which prevents moisture 
condensing, a matter of great importance. 
In the French department, Du Vivier and Co. exhibited a novelty in the 
Aubin Bolting Mill Stones. This consists in the lower stone having spaces 
from the circumference to the centre, occupied with metal bolting-sieves, 
which are agitated by knockers. The flour passes through the sieves, and 
is collected below, whilst the bran escapes through openings between the stones. 
In the American section were several exhibits of metal mills, which were 
generally meritorious, both on account of material used and efficiency of ope- 
ration. Messrs. Sedgebeer and Miller, Ohio, in their Nonpareil Farmer's-feed 
and Corn-Mill, have a very useful machine. The runner is a vertical disc- 
wheel, covered with Y-shaped projections ; the lower part of each tooth in its 
