168 
workmanship, a much more perfect va- 
cuum will be obtained. 
The present model is estimated by 
the inventor as equal to about a one- 
horse and half power steam-engine. 
The working-cylinders are about eight 
inches diameter, and the length of the 
beam about four feet. The whole en- 
gine not occupying an area of more 
than about four feet six inches by two 
feet. But the frame-work of this en- 
gine would be sufficiently strong for an 
engine of ten times the power; there 
being neither any lateral pressure, or 
strain on the materials; nor vibratory 
motion from the working of the engine. 
The mode of working pistons’ and 
turning a fly, will be described in a future 
number, with some further particulars 
respecting the application of this power. 
The specification amply provides for 
the endless changes of the, mechanical 
parts and construction of the engines, 
while it appears safely to secure the 
combination by which the vacuum is 
effected. 
——— 
To Sir James Jetr, of Oakland, near 
Newnham, Gloucester, for a Combina- 
tion of Machinery for working and 
ornamenting Marble.for Jambs, Man- 
tles for Chimney-pieces, and other 
Purposes.—Dec. 20, 1822. 
This is a mode of cutting any descrip- 
tion of parallel mouldings upon marble 
slabs or blocks, for ornamental chimney- 
pieces and monuments, and other mar- 
ble or stone decorations. The machmery 
consists of a fixed frame, on which the 
block or blocks are Jaid and secured, and 
of a sliding frame, to which the cutting- 
tool is attached. ‘This cutting-tool is a 
plate of metal, formed with grooves and 
elevations, which, by repeatedly travers- 
ing to and fro with the aid of sand and 
water; grinds the surface of the marble 
slab to the form of the cutter.—London 
Journal of Arts. 
———— a 
To Ricuarv Git, of Barrowdown,Rut- 
’ land, Fellmonger, for his*new Method 
of preparing, dressing, and dyeing 
Sheep Skins and Lamb Skins with the 
Wool on, for Rugs, for Carriages, 
Rooms and other Purposes. July 24,1823. 
The skins are to be first thoroughly 
washed in a running stream, so as to 
cleanse the wool from every kind cf 
dirt : they are then to be stretched upon 
frames, the extraneous or refuse por- 
tions on the edges being trimmed off. 
The inside of the skin is then to be well 
scraped with a parchment-maker’s knife, 
for the purpose of removing the grease 
New Patents and Mechanical Inventions. 
[Sert. I, 
and flesh which may have adhered; and 
afterwards, keeping the back of the skin 
upwards, and placing the frame upon 
trussels, it is to be covered with a solu- 
tion of sumach and boiling water, in the 
proportion of a gallon of water to every 
pound of sumach. This material is to 
be spread over and well worked into the 
skin with the knife before mentioned, 
by which means the skin will become 
tanned, When the sumach is sufficiently 
dry, the reverse side of the skin is to 
be placed upwards, and the wool tho- 
roughly washed with strong soap and 
water, and then with clean water, until 
the grease is perfectly removed. After 
having been gradually dried in the air, 
the back of the skin is again covered 
with the sumach, and, when perfectly 
dry, any roughness is polished down 
with pumice-stone. Ifthe wool is to be 
white, it must be bleached, by placing it 
over the fumes of sulphur in a close ves- 
sel; it is afterwards to be carefully 
combed out, and the face dipped in 
water tinged with blue. But if the wool 
is to be dyed or coloured, its face must 
be several times dipped in a suitable 
menstruum ; an extract of fustic is pro- 
posed, but many other materials will 
answer the purpose, and the colour may 
or may not be raised with a mordant, as 
shall be required. The wool should 
then be well washed, in order to get rid 
of the colouring matter; and after dry- 
ing, dressing, and trimming the sides of 
the skins, the rugs are fit for use.— 
London Journal of Arts. 
i 
To James Surry, of Battersea, in the 
County of Surry, Miller, for his Inven- 
tion of anew Method of applying Heat 
for the producing of Steam, and for 
various other Purposes, whereby the 
Expense of Fuel will be lessened.— 
4th September 1823. 
The patentee proposes to take advan- 
tage of the heat whichis uselessly evolved 
in coke ovens, and to apply this heat to 
the generating of steam, for any purpose 
to which steam may be applicable, without 
any expense of fuel. To effect this ob- 
ject, he constructs metal pipes, which 
pass through the coke ovens from back 
to front, and keeps them filled with 
water from any convenient reservoir. 
These pipes becoming heated by the 
combustion of the’gas and smoke emit- 
ted from the coal, steam is generated 
within, which passes off through other 
pipes to the steam receptacle, ready to 
be employed as the motive force of an 
engine, or for. any other use.—London 
Journal of Arts. 
