1$11.] I 
451 J] 
PATENTS LATELY ENROLLED. 
3 —=—— 
*.* Communications of Specifications and Accounts of New Patents, are earnestly 
solicited, und will always command early notice. 
MR. THOMAS POTT’s, (HACKNEY), for a 
new Process of Freeing Tarred Rope 
from Tar, and of rendering it of Use 
to the Manufacturer. 
YVHE process made use of for freeing 
A | tarred rope from tar, may be con- 
ducted in three different ways: first, by 
means of sulphate of alumine (common 
allum); secondly, by sulphate of alumine 
and fullers-earth; and thirdly, by fullers- 
earth alone. When sulphate of alumine 
is used, the rope isto be cut into prover 
Jengths and opened, and: boiled in water, 
in which is mixed five pounds of sulphate 
of alumine, to every cwt.of rope. When 
boiled an hour it is to be taken out and 
beaten, and the operation repeated. 
The rope is next to be bowled with a car- 
donate of lime, whitiny is the most pro- 
er. It is them to be cleaned and 
~ bleached either on the grass or with oxy- 
muriatic acid. The operations are some- 
what similar when fullers-earth is used, 
or fullers-earth with alum; bat the pro- 
portions of the materials differ; for an 
account of which the reader is referred 
- to the specification. 
ya ae ; 
MR. JOHANN GEORGE DEYERLETIN’S, (LONG 
AacrzE), for a Machine, new Principle, 
or Method of making Bricks and Tiles, 
and other Kinds of Pottery. 
The machine consists of a box or other 
receptacle into which the clay is put, 
and also a plug, or forcing instrument, 
by means of which the said clay is forced 
enwards during the work, so as to urge 
the same through one or more suitable 
openings or orifices, which give the figure 
ev form; and also certain mill-work for 
giving motion and effect to the plug or 
forcing “instrument, and also a fit car- 
riage for receiving and conveying away 
the bricks or other products of art; and 
if need be another carriage for supporting 
and conveying the combinéd or united 
parts during the time of working, or from 
place to place. The use and applica- 
“tion of the machinery ‘are shewn in 
drawings attached tv the specification, 
and the necessary eaplanations given in 
it. By these it appears that by what 
the patentce calls every home and out 
stroke af this machine, fifty-six bricks 
will be finished; or if the power of the 
first mover is increased either by addi- 
onal men or otlcrwise, the barrew 
may be made as long again, and the mae 
chine increased to double the size; by 
which means about four times that num- 
ber of bricks may be produced in about 
the same time, and so in proportion to 
the first mover, the product of the mas 
chine will be more or less, The mode 
of making tiles is described with preci- 
sion, and it appears that the operation 
in all instances depends upon what is des 
nominated a mouth piece, which is 
screwed to the box by a flanch, having 
in it suitable openings or orifices therein. 
Thus there are different mouth-pieces 
for making mouldings to ornament build. 
ings, and channels to convey water; and 
itis plain that whatever shape the hole 
is made into, the sanie furin will be ob- 
tained by the clay pressed through it, 
which is received on bandages over rol- 
lers, to the length required, and then 
cut off even at each end by the separator, 
Tubes and pipes are made in round or 
square boxes, or receptacles of wood or 
cast iron, The piston should fit nearly 
tight, and be supported, or side-steadied, 
when lifted above the round or square , 
box or receptacle,.in order that it may 
be filled. Tubes of all kinds and dee 
scriptions, whatever be their shape, may 
be thus readily made. : 
ST 
MR. PETER STUART'S, (FLEET-STREET), 
Sor a new Method of Engraving and 
Printing Maps, Sc. 
This method is for the purpose of come 
bining the arts of enyraving and letter 
press priating, so as to produce dispatch 
and economy of the latter, with the ef= 
fect of veneral utility. The printing 
maps, figures, &c. for books, magazines, 
newspapers, &c. consists, in the first 
place, in reversing the ordinary or com- 
mon way of printing or representing such 
figure or figures; that is to’ say, where 
the usual mode of printing or engraving 
the figures now described has hitherte 
been by a black upoa a white ground of 
surface, the new method is by intros 
ducing the contrary effect, viz, by a 
white upoa a black ground or surface. 
In other words, as the usual way of 
printing or representing in maps, for’ 
iustance, the rivers, towns, fortifieations, 
letters, or words, &c. &c. has been by 
black upon white, the new method js 
by producing a contrary ¢ffect, by leaving 
whe 
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