[. 354] 
[Nov. 1, 
PATENTS FOR MECHANICAL AND CHEMICAL 
INVENTIONS. 
[It was our intention to haye given some 
further account of Mr, Brown’s New Va- 
cuuM ENGINE in our present number; but 
we feel obliged to defer it to our next num- 
ber (for December), which will contain a 
more detailed account of that beautiful in- 
vention, as applicable to the propelling of 
carriages and. vessels. 
To Joun Gunpy, of New Kent Road, 
Sword and Gun Manufacturer, for 
his new-invented Process, by which a 
certain Material is prepared and ren- 
dered a suitable substitule for Leather. 
—August 1824, 
HE foundation upon which the pro- 
cess is to be employed may be 
cloth of any kind, either linen, woollen, 
cotton, or felt, as any of these sub- 
stances are convenient for the purpose, 
which materials should be stretched 
upon suitable frames. When the sub- 
sance is intended to be pliable, a com- 
position of the following ingredients is 
to be used. Common glue size, in a 
gelatinous state, about four parts; fat 
linseed oil, after having been boiled, 
about. two parts; lamp black, halfa part; 
white lead, ground fine in a mill, about 
one part; and pipe-clay also, ground 
fine, about one part. 
When the size is sufficiently melted 
over a fire, the boiled oil is to be added 
by degrees, keeping it constantly stir- 
ring until properly blended, then add 
the lamp black, the white lead, and the 
pipe clay, and’ when the whole is per- 
fectly mixed and blended together, the 
composition may be considered as ready 
for use. “a 
The cloth having been strained, as 
before said, upon suitable frames, the 
composition may be laid on in a warm 
state by a pallet knife, observing that 
the interstices must be perfectly filled, 
so that when dried and cut, the cloth 
may be found perfectly saturated with 
the composition. The frames, with the 
cloth so prepared, are then to be put in 
an open situation exposed to the air, 
or in a moderately warm drying-room, 
as the season of the year may require, 
it being a very essential part of the pro- 
cess that the composition shall be made 
to dry gradually. 
When the first coat has become hard, 
a second, third, and fourth, as may be 
found necessary, should be laid on, tak- 
ing care that each coat has become dry 
before another is added, and it is im- 
portant that the composition be spread 
. 
equally and as thin’ as possible, as a 
superabundance would prevent the de- 
sited pliability. “The surface should be 
rendered smooth, and for this purpose 
it is proposed to cut the material so 
prepared into strips, and to pass it be- 
tween pressing rollers. 
In order to give a polish to the sur- 
face of the material after it has become 
smooth, a coat of drying oil or a var- 
nish is to be laid upon its surface, which 
may be mixed with colour for the pur- 
pose of giving it any required tint; by 
which means when dry it will appear 
like japanned leather, and is ready to 
be cut up for use. The patentee speaks 
only of employing it for making patten 
ties, “ such ties being finished in dies 
under a press or stamp, similar to rais- 
ing impressions on paper, metal, or 
horn.” 
For purposes which do not require 
pliabilitv, such, for instance, as coach 
tops, to the gluc-size, the pipe-clay and 
white lead may be added in such quan- 
tities as the nature of the article may 
require. When the pieces are too large 
to be passed through a roller-press, 
then the inequalities may be reduced, 
and the surface polished with powdered 
pumice-stone, tripoli, or other grinding 
material, and after having become 
smooth, the oil or varnish-colour may 
be applied as often as may be found 
necessary, 
To Maurice pe Joncn, of Warrington, 
in the County Palatine of Lancaster, 
Cotton Spinner, for his new-invented 
Mode of constructing and placing a 
Coke Oven under or contiguous to 
Steam or other Boilers, so as to make 
the Heat arising from making. Coke, 
or other intense Combustion in the said 
Oven, subservient to the use of the 
Boiler, instead of Fuel used in the 
common way, and to exclude such Heat 
Jrom the Boiler when required, without 
detriment to the Operations of the 
Oven. —August 1824. 
The principal feature of this inven- 
tion is, combining a boiler with a coke 
oven, for the purpose of beneficially 
employing the heat which radiates from 
the oven in generating steam, or, boil- 
ing water for brewing, or any other use, 
without the expense of fuel, and which 
plan also embraces in its detail conve- 
nient 
