1824.] 
nient modes of regulating the heat com- 
municated to the boiler, and of cutting 
it off altogether if required. 
The patentee proposes to place an 
oven of about eight feet diameter under 
the front part of a boiler, so that the 
centre of the oven shall be about two 
feet six inches from the front to the 
boiler, The wall of the cven is to be 
straight for about eighteen inches high 
in the usual way, and above this the 
crown or arch rises about two feet six 
inches. In the centre of the crown a 
circular opening is formed of about two 
feet diameter, which is denominated the 
crater: through this the heat is intended 
to pass to the boiler above, the under- 
side of which is brought as close to the 
top of the oven as possible. From the 
crater: the heat proceeds through a cir- 
cuitous flue round the boiler, and thence 
to the chimney as usual. 
The span between the bottom of the 
boiler and the oven is to be all enclosed 
except about one foot square, where a 
fire-proof damper is to be suspended by 
a chain passing through the upper part 
of the brick-work. This chain is con- 
. ducted over a pulley, and carries weights 
as a counter-balance to the damper, 
which slides up and down in grooves, 
for the purpose of opening or closing 
the square hole. 
Close to the crater on the top of the 
oven two iron plates are placed parallel 
to each other. They are fastened to- 
gether in front by a cross plate, and 
behind are worked into a low wall of 
two courses of brickwork erected across 
the top of the oven. -At a small dis- 
tance from the plates ribs of iron are 
laced, on which fire stones or fire bricks 
are laid, in order to form a cover to the 
crater. This cover is made to slide on 
the plates over the crater by means of 
racks on the side-bars, which racks pass 
through the front wall to the outside of 
the building, and are there worked by 
pinions fixed on a revolving shaft turned 
by hand, thus the crater may be par- 
tially or entirely opened or closed. 
Another flue, about six inches lower 
than the crown of the oven, is formed, 
to communicate directly with the chim- 
ney, where there are dampers to open 
or shut this, and also the boiler flue, 
In front of the oven is an iron frame, 
forming a door, to be lined with fire- 
brick. The method of lining this door 
is by cutting the uniting edges of the 
fire-brick in a bevel and dove-tailed 
_ form, so that one lapping over the other 
Patents for Mechanical and Chemical Inventions. 
355 
the whole is made fast by securing the 
key brick. The patentee observes, 
Now it will readily be understood, that 
when the cover is removed from the crater, 
and the damper of the oven flue shut, the 
heat operates upon the boiler, and raises 
steam; by means of the inclosure damper, 
the heat may be kept longer under the 
boiler, where it acts more powerfully than 
in the flues, and when required to remove 
the heat from the boiler, the crater damper, 
or cover, must be shut (by means of the 
racks and pinions), also the boiler damper 
in the chimney must be shut, and the oven 
damper opened. By these means, such a 
portion of heat may be applied to the boiler 
as may be required, and the operation of 
making good coke still goon, and the coke 
will repay what the coals haye cost or 
more. ‘The boiler is very greatly preserved 
by these means, as no cold air comes in 
contact with it, nor coals, nor coal-rake ; 
the smoke is also burnt; as it is well 
known, that to make good coke, about fifty 
square inches of opening in the chimney 
are at first sufficient, and nine at last ‘This 
small opening keeps the heat so much back 
in the oven, that the smoke is nearly all 
consumed before it can pass off, 
The claims of the patentee are, a 
method of constructing a coke oven in 
connection with a boiler, -so as to make 
the heat arising from the coke answer 
the purpose of fuel used in the common 
way; and to take off the heat from the 
boiler, when required, without detriment 
to the operation of cokeing. The ad- 
vantages derived are considered to be 
great ; in the first place, the expense of 
fuel is repaid by the coke; secondly, 
the preservation of the boiler is effected 
in a greater degree than could be ima- 
gined, as no cold air is admitted to it, 
nor Is the fuel, or any other matter, suf- 
fered to touch its bottom; hence it re- 
mains unimpaired, and free from the ef- 
fects of sudden expansion or contraction; 
thirdly, the consumption of smoke in 
the coke oven is most complete, and if 
required, a retort may be added for 
generating gas. 
We are favoured by the following 
remarks from the patentee : 
During last winter I have worked an 
oven under a Jarge boiler of twenty-six 
horses power, and regularly sold the coke 
to iron founders, millers, and malsters ; but 
as this boiler was connected with others, 
and the effect of burning the smoke could 
not be distinctly seen when the other 
boilers were also worked; I have built a 
separate chimney, and put a distinct boiler, 
with an oyen under it,'to that chimney, and 
successfully now, work. my patent coke 
oven in the manner before deseribed, and 
am now building more oyens in this town 
222 The 
