1809.} 
the hearth; and which, by being let down 
in part will greatly assist in preventing 
chinnies from smoking; and by being 
Jet down entirely, will so exclude the 
current of air, as to éxtinpguish the fire in 
the grate or stove, &c. 
To this specification are annexed seve- 
ral drawings, which are good represen- 
tations of the methods adopted by the 
inventor: thus we see a planof the appa- 
ratus, which is to be fixed at the top of 
the chimney. This is to have two retort 
flues, and two or four dispersing flues. 
We have also plans and elevations of 
every part of the apparatus, with such 
descriptions as will enable a mechanic to 
make the whole for himself, when the 
patentee’s right expires. In speaking of 
the screen, we are told, there must be a 
apk in the hearth- stone for the plate 
fall in, one-fourth of an inch deep: 
meni be half a plate, merely for 
preventing the smoke only, but not. for 
extinguishing the fire, to have four wheels, 
and work in a frame, to act either with 
or without weight or pullies; but if with- 
out, there must be two springs, one on 
each bottom corner near the edge. 
Observations.—We have attentively 
considered many inventions, that have 
been devised for the cure of smoky chim- 
nies, and for the prevention of those in-_ 
juries to which the furniture of rooms is 
liable, from the dust and smoke occa- 
sioned in raking out fires at night. We 
have witnessed several schemes, which, 
in theory, have appeared well adapted to 
the purpose, either of preventing an 
evil, or of curing one that already eXx- 
ists; yet, when put to the test of expe- 
riment, they have been found perfectly 
inadequate to the purpose. On this ac- 
count, we are unwilling to pass judg- 
ment on Mr. Warren’s method. As far 
as our experience BOES, we will venture 
to affirm, that the ‘* Smoke Dispersers,” 
sc common in the metropolis, and other 
parts of the kingdom, will be more effec- 
tual in curing a smoky chimney, than any 
thing we. have seen; yet these are not 
certajn 10 their effects; they will do much, 
but canuot be relied on as infallible, and 
from the nature of the material, they 
must be liable to a speedy decay, from 
the depredations of the atmosphere. We 
shall be vlad, if the invention, that we 
‘have now been considering, shall better 
answer the purpose than the “ sinokeé, 
dispersers.” With regard to the other. 
part of the invention, it does seem to us 
much inferior to that described in our Jast 
Number, ‘page 66, invented by Mr. 
i 
New Putents lately.enrolled. 201 
Younie,* to, which we refer our readers, 
fora very: useful, safe, and economical 
contrivance. ~ 
TE 
MR, JOSEPH ISLETI’s (STRATFORD), for 
a Method of producing fust Greens on 
Cottons, and various other Ariicles. 
Mr. Islett’ s invention consists in come 
bining a yellow mordant with indigo blue, 
and thereby producing fast greens on cot~ 
tons, cambrics, linens, &c. He takes 
twelve quarts of muriatic acid, adding 
thereto, by degrees, one quart of nitrous 
acid, and the whole is to ke saturated 
with grain tin, It is then to be boiled 
In a proper vessel till two-thirds are eva- 
porated. He sometimes neutralizes the 
solution, by boiling a pound of fresh 
slacked lime, and the same quantity of 
pearl-ash, or soda, in a gallon of water, 
and keeping the clear solution, in bottles, 
from the action of the air. ‘lo prepare 
the indigo for mixing with the solution : 
he takes nine pounds of indigo, half a 
pound of orange orpiment, and grinds it 
in about four quarts of water; he then 
takes three pounds of gum senegal, and 
dissolves it in four quarts of water, inixes 
it well with the indigo, and grinds the 
whole in the usual way. The manner of 
mixing the solution of tin with the pre- 
pared indigo, to make it fit for printing, 
is thus: Take two galions of the indigo 
prepared as above, then add to it, by 
degrees, or small quantities, one gallon 
of tlie evaporated or neutralized solution 
of tin, neutralized by adding as much | 
caustic alkali, prepared as above, as can 
be added without precipitating the tin 
from the acids; keep it stirring all the 
time it is mixing, < and it will be fit for use 
and. may be applied in the usual way of 
printing on cotton, &c. For a lighter 
shade of. green less indigo will be neces- 
sary. After being printed, the goods are 
to be dipped ia the usual way of dipping 
China blues, butthey must not be al 
lewed to drain, but must be meved from . 
one back or vat to another, as quick as 
possible; then to be cleansed in the 
usual way, in a sour vat or back, in the 
agente of about one hundred and 
fifty gallons of water to one gallon of oil 
of vitriol; then to be well washed in the 
usual method of voods for raising in’ de- 
coctions of weld and other yellow-co- 
louring drugs, then in the usual way to 
be branned or bleached tll they become 
white. 
.* The reader is requested to alter, at he 
page referred to, the name James Young, to. 
that of James * Younie.” 
VARIETIES, 
