at the Warwick Mectiiif/, 1859. 02') 
attracted great attention, and was, in fact, the most attractive macliino in 1]:o 
sliow-yavd. It professes to take clay (drj- and hard) from the liillside, or else- 
where, and without a drop of water to make it into a good hard Inick, ready 
for the burning; ; and this it effected in a very surprising manner. It is not 
important that the clay should be pure, for by its process of grinding it con- 
verts gravel and small stones into like powder with the clay. It also makes 
good bricks from raw silica. All this is done by the expulsion of the air 
causing it to cohere by a powerful upward ])ressure. The flying dust of one 
moment is a dry solid brick the next, and so hard that, for inside work, it 
need not necessarily be burnt. We should observe that dry clay, in its 
natural state, holds from 15 to 25 per cent, of water, which only great 
lieat can abstract. This aids the close adhesion. Bricks thus made arc 
luiusually heavy, weighmg about eleven pounds, and burning to about nine 
pounds. They are admirably fitted for the internal work of sewers and founda- 
tions for great buildings, as well as the whole structure. The machine is a 
compound one ; the mill for grinding, and the moulder for the making. The mill 
is a common crushing mill, with heavy revolving rollers on a table or circular 
platform, around which are gratings, through which the dust passes into an 
iron pan beneath, from whence it is by elevators raised to the hoppers above 
the machine, to descend through a spout into the moulds for the pressing. 
This is done as follows : motion being communicated, the tappet-wheel turns 
the mould-table the length of one mould : this circular table contains sixteen 
moulds, and revolves at an equable moderate pace. This action delivers two 
empty moulds under the hopper to receive the clay-dust, delivers two bricks 
to the attendant, and gives a powerful upward pressure to the clay. The table 
is then momentarilj- stationary, while the two excentrics prepare and deposit 
the charge for two bricks, the tappet-wheel again turns the table, and thus the 
making proceeds. The whole motions of the machine are performed by a ijair 
of cam-wheels, other pressure being communicated by a pair of rollers running 
in the cams, with the mould-pistons fixed on a shaft between them. It will 
thus make twenty-four bricks per minute, and driven by a 6-horse power 
engine it is capable of giving a pressure of 330 tons upon each brick, which can 
be increased according to the power of the engine. The ordinary jiressure is 
about 40 tons, depending upon the quality of the clay. The machine itself 
weighs about 22 tons. We had the benefit of the assistance and the advice of 
most of our colleagues relative to the utility and novelty of the application of 
this process in the manfacture of bricks for general use, and the result was the 
unanimous award of the Society's Silver Medal. This machine is patented by 
Messrs. Hervey and Walsh, of Wakefield. 3Ir. Chamberlain also exhibits two 
<3ther machines : one (invented by Messrs. Bradley and Craven) for the manufac- 
ture of bricks from plastic clay upon a somewhat similar principle, i.e. a revolving 
table with moulds. The operations of pugging, moulding, and delivering 
proceed simultaneously. This machine delivered beautifully made bricks from 
the plastic clay at the rate of 35 per minute, the moulding and pressing 
being similar to the large machine. We also awarded to it the Silver Medal. 
The machine which received the second prize was invented by ilessrs. Wright 
and Green, Eugby. This forces through the face a clear beautiful column of 
clay, from which it cuts by its revolving wire from a kind of web about 50 
bricks per minute, and pipes or tiles after the same proportion. Mr. White- 
head, of Preston, exhibited several excellent machines in this class. His steam 
machine is a very efiective one, and manufactures beautiful bricks with great 
exactness and rapidity, and tiles or pipes in the same ratio. The clay has to 
be well prepared, and then the daily produce may reach to from 15,000 to 
20,000 bricks. We awarded to it the prize of 10?. His smaller machine appears 
to require much preparation of the clay before screening. When this is done 
it makes excellent bricks or pipes. We awarded it a commendation. His 
hand tile-machine is exceedingly good, and worthy the second prize, which wc 
gave it. 
