440 
ifronorarg Serrrtarg. 
William Sykes Ward, Esq. 
Iljonorarg (Curators. 
T. W. Embleton, Esq. | J. G. Marshall, Esq. 
Suottors- 
Benjamin Biram, Esq. | G. W. Chambers, Esq. 
91 oral treasurers auti Secretaries. 
Dr. Alexander, Halifax. H. C. Sorby, Esq., Sheffield. 
Henry Briggs, Esq., Wakefield. | R. D. Baxter, Esq., Doncastcr. 
Mr. Armytage was then called upon to explain the Model 
(upon the table) of Messrs. Robinson and Co.'s Smoke Con- 
suming Furnace, which he briefly described as follows: — 
That the usual construction of furnaces is to pass the 
smoke over the bridge of the boiler by an up draught into the 
flue, and thence to the chimney ; Mr. Armytage said in this 
mode a down draught was obtained, and smoke and the other 
gases had to pass through their own fire, and were thus con- 
sumed. The fire box contained two grates, the upper one 
of which is formed of hollow tubes, connected at one end 
with the boiler, and at the other with a waterspace in front, 
through which the water continually and rapidly circulates ; 
this upper grate alone is fired, and employing a down draught 
or current of air, admitted through the upper doors, the 
gases, smoke, &c, from the green coal, when put on, pass 
through this fire downwards, and whatever may escape is 
consumed by coming in contact with the upward flame from 
the lower grate. This low grate, formed of ordinary rocking 
bars, is entirely fed by the half-consumed coal, or cinders 
falling through the upper tube grate ; and the fire from this 
low grate burning upwards, its flame meets the downward 
fire from the upper grate and passes through the flues in the 
ordinary way. The second range of larger tubes is put in 
for additional healing surface. The construction of the fur- 
