1800.] 
pump, the parts of which may be varied, 
as to their dimenfons, materials, fhapes, 
&c. It is impoflivie, without the aid of 
figures, to give any accurate idea of the 
plan adopted by the patentee, and which 
is defcribed in the fpecifications by means 
of coloured drawings. 
a SEI 
MR. WILLIAM sCOTT’S (SAST SMITH- 
FIELD), for Improvements im manu- 
jfaduring and working various Kinds 
of Gla/s. 
The object of this patent is to grind 
and polith gla!s of various fpectes, of a 
thinner fabitance than has hitherto been 
practiled, and rendering it fit for window- 
fafhes, mirrors, &c either from. plate or 
fliat- glats, by expanding it in the procefs 
of manufa .Quring, by a rotafive motion, 
ina fimilar manner to window-gla!s, pre- 
ferving fuch thicknefs in the blowing as 
may be deemed neceflary. When drawn 
from the annealing kilos, to be cut into- 
{quares, placing two, three, or more, up- 
on each other, in fpreading or annealing 
kilns, upon flat furfaces of Hones, elals, 
or other fubitances, and producing fucha 
degree of heat a's will caufe the glafs to 
give or yield to the furface thus placed 
upon, thereby becoming flat and adapted 
for grinding, and polifhing without grind- 
ing, rendering it fit for fiivering, at which 
time they fhould be withdrawn. 
Allo to grind and polifh theet or fpread’ 
glafs, as has not been made or intended 
for that purpofe; namely, grinding and. 
polifhing, by flattening, as above de- 
{eribed, and by buckling, tying, or fixing 
fuch to beds cf platter, for grinding and 
for polifiiine. 
The methods hitherto ufually adopted» 
for manulacturing plate-glafs intended for 
{uch purpoles are, by blowing cylinders, 
and cutting them open with fhears, or 
caftine on meal tables; either of which 
procefies requires a thicknefs far exceed- 
ing the mode here propofed. 
— aa 
MR. SAMUEL ANNESS’S (RED LION- 
PLACE), for Methods of preparing and 
applying Enamel Colours to the orna- 
menting ufeful Veffels of Glafs. 
The objet t and purpofe in the compo- 
fition of thefe culours, belide their parti- 
cular refpective tints, confit 1a making 
them fo fufible as to meit or adhere to vel- 
fels of glafs. by a degree of heat not fo 
confiderable as to melt or injure the vef- 
fels themfelves. The following are only 
a few of the methods, prepofed and re- 
commended by the patentee, but they are 
New Patents lately enrolled. : 353 
thofe which he-confiders as the moft to be 
preferred :— 
To prepare the flux or principal matter 
for enamelling om gla/s veffels.— Take one 
pound of farurmus glorificatus (to pre- 
pare glorificatus thus: take litharge of 
white lead, put it in a pan, pour on dif- 
tilled vinegar, Kirring it well over a gen- 
tle fre till the vinegar becomes impregnat- 
ed with the falt of the lead, evaporate half. 
the vinegar, put itin a cool place to cryf- 
tallize, and keep the cryftals dry for u ue : 
halt a pound of natural cry'tal calcined to 
a whitenels ; one pound of falt ef polve- 
rine, or other fit alkali; mix them toge- 
ther, and bal 
twelve hours, then melt the mats,-and 
pulverize the lame in an agate mortar, or 
ay other proper veflel wh:ch 1s not capa- 
ble of communicating any metallic or 
other impurity. 
To.make green.—Take one ounce ot 
copper duit, two ounces of fand, one 
ounce of litharge, half an ounce of nitre; 
er two of copper, one of fand, two of 
litharge, one and. a half of nitre; mix 
them with equal parts of flux, or vary the 
proportions of ‘them, as may be found ne- 
ceflary, according tothe tint of colour 
required. 
To make Rech —Take calcined iron 
one ounce, cobalt, crude or prepared, one 
ounce, or zaffer two ounces, and mangas 
neze one ounce; mixed with equal parts 
of flux, by melting or grinding together. 
To make yellow.—Take of lead and tia 
afhes one ounce, itharge one ounce, an- 
timony one ounce, fand one ounce, nitre 
four ounces 3 calcine or melt them toge-- 
ther, pulverize, and mix them with a due 
proportion of flux, as the nature of the 
glafs may require; or take more or lefs 
‘of any or al) the above, according to the 
depth of colour defired. 
To make blue.——Vake prepared cobalt 
one ounce, fand one ounce, red Jead one 
ounce, nitre one ounce, flint-glafs two 
ounces; melted together, by fire, pulves. 
rized and fluxed according to the degree 
of foftnels or ftrength ot colour required. 
To make olive-—TVake one ounce of the 
blue as prepared above, half an ounce of 
black, half an ounce of yellow; grind 
them for ufe; if neceffary, add flux to 
make it fofter. 
To make wihite.—Take tin prepared by 
aqua-fortis one ounce, red lead one ounce, 
of white pebble-ftone or natural cryltal 
two ounces, nitre one ounce, arfenic one 
drachm, with equal parts of flux, or more 
or lefs as the foftnefs or opacity may re- 
quire; melted, calcined, or uted raw. 
Ta 
e ina flow heat for about. 
