1810.] 
bear. The lower part, or cradle, is made 
in the shape of a common pen, with a slit 
up the nib: the cradle has a plate sol- 
dered on the front of it: the lower end 
of the plate is fitted nearly close to the 
inner part, or hollow of the nib, but left 
louse, and ina slanting direction towards 
the point, and below the top of the slit 
up the nib, so that in writing. the nb 
bending, it lets the ink pass freely, but 
Not too copiously, to the point. 
Mr. F. claims, as part of his invention, 
the method of cutting and filing the 
socket of the pen, hollow in shape like 
the nib of a pen, and meking a small 
groove at the point, instead of the slit. 
aE 
MR. JONWN DAVENPORT’S, (BARRLEM,) for 
a@ Method of-ornamenting all kinds of 
Glass, in Imitation of Engraving, &¢. 
by Means of which any Designs, how- 
ever elaborate, may be executed in-a 
Siyle of Elegance hitherto unknown. 
The method heretotorce known for 
engraving on glass, has been by means of 
a machine with wheels, of different sub- 
stances, which have been employed with 
sand, &c. to grind off some parts. of the 
surface of the glass which is to be en- 
graved on, and then by means of grind- 
ing and polishing different parts on the, 
rough surface, the different figures are 
formed according to the designs given. 
By this invention, instead of grinding or 
taking off any part of the surface of the 
giass, the patentee, lays on an additional 
surface or coating of glass, prepared. for 
the purpose, which when salbjected to a 
proper degree of heat, will incorporate 
with the glass to be operated upon, so’as 
to produce an effect similar to that which 
has hitherto beén obtained by means of 
grindmg. When it is required to or- 
nament glass, then, previously to the 
heat being applied, with an etching or 
engraving tool such parts are to be 
taken out as will produce the required 
effect, and that in a much superior way 
* to the etfect produced by the usual mode 
of griuding, polishing, &c. The; mate- 
rials used are to be melted in a crucible, 
or other pot, and they are to be inude up 
in the same manner, as-if used for the 
making of the best flint glass, broken 
glass, or as it 1s usually denominated, 
“ cullitt” being the principal ingredient 
init. Mr. D. gives several mixtures, of 
which the first is,—160 parts of cullite, 
—10 of pearl ashes~-40 of red lead, 
e—10 of arrence. 
The second is—1i20 parts of cullitt, 
Monruty Mac, No, 195. 
New Patents lately enrolled. 
65 
160 of red lead,—60 of sandj—60 of 
borax. ; 
~The third is—70O parts of red: lead, 
—224 of sand,—40 of calcined borax. 
When these are subjected to sucha 
heat, ds to be thereby completely fused, 
he takes equal parts of each mixture, 
and grinds them to an impalpable pow- 
der, for the purpose of betig mixed with 
a menstruum proper for coating the 
glass. / 
The menstruum consists of one part of 
double-refined loaf-sugar, dissolved -in 
two parts of pure water; to which is ad« 
ded, at the time of mixing the powder, 
about one-third part of common writing- 
ink; the effect, we are told, produced by 
this addition, is similar to that produced - 
by the addition of oxyd of manganese, 
used in a small quantity by the glass- 
makers, in making their best flint-glass, 
because without such an addition the 
specimens would be of a cloudy or 
milky appearance. _A quantity of thig 
menstrwum is used sufficient to render 
the ground-mixture of 4 proper cons 
sistence, for laying on with a thin smooth 
surface. When the coating or mixturé 
is thas prepared, the glass is to be coated 
by means of a camel’s hair brush, of 
squirrel’s foot, &c., it is then to be exe 
posed to a heat sufficient to produce a 
semivitrification of the coated surface, 
and to incorporate it with the substance 
or body of glass, so coated. But the 
heat must not be carried higher than this, 
because in that case, a complete vitri+ 
fication would ensue, and the desired 
effect of having a surface in imitation of 
the rough ‘surface produced by grinding, 
would not be obtained: the article must, 
under such circumstances, be recoated, 
and submitted again to the fire. If after 
the coating has been applied, any bore 
ders, cyphers, or other ornaments, are 
wanted to be executed thereon, then, 
previously to the heat being applied, with 
an etching or engraving tool, such parts 
of the coated surface must be cliased ont, 
as will produce the desired effect, after 
which the requisite degree of heat is tu 
be applied. 
This invéntion is not only applicable to 
all kinds of useful and ornamental articles 
of glass-ware, on which the common 
methods of engraving have heen prace 
tised, but may be applied to window- 
glass and plate-glass, of every description, 
in place of grinding, for the purpose of 
muking window-blinds, It 1s also said to 
be peculiarly adapted to produce beau- 
aye tiful 
