r
4
GLASS. —Composition.
prises all glass worked into the form of vessels or tubes.According to the purity of the “ metal,” which is thetechnical term given to glass in the fused state, thisvariety is subdivided into different qualities, such as—Ordinary bottle - glass, consisting of silica, potashor soda, lime, alumina, and oxide of iron; glass usedfor medicinal bottles, consisting of silica, soda, lime,some alumina, and a very little ferrous oxide; whitebottle-glass for bottles or phials, tumblers, tubes—containing silica, soda or potash, and lime.
Window-glass, including English crown and cylin-der or sheet-glass: this is a silicate of potash or soda,lime, and alumina.
Plate-glass, composed of silica, soda or potash,lime, and a little alumina. This variety only differsfrom the preceding by the greater purity and free-dom from colour of the materials.
Flint-glass, used for grinding, &c., composed ofsilica, potash, and oxide of lead.
Crystal, for optical purposes and table-ware, con-sists of silica or silicic acid, and potash, with morelead than the preceding. In short, it is a simple flint-glass, formed with very pure materials.
Stkass, or the substance composing the imitationof precious stones, known as paste, consists of silicaand potash, with a still larger amount of oxide oflead: it is coloured by various materials.
Enamel, a silicate and stannate or antimoniate ofpotash or soda, and of oxide of lead. It may beotherwise described as composed of silica, soda orpotash, and oxide of lead—rendered opaque byoxide of tin or antimony.
Soluble Glass, which is a simple silicate of potashor of soda, or a mixture of these two silicates.
ancient glass.
Analyst.
Si0 2 -
Na 2 0.
K 2 0.
MgO.
MnO.
PbO.
Fe 2 Oa.
Al a 0 3 .
so 3 .
Egyptian glass rod, colourless,.
“ small block, grass green,..
Benrath.
72-30
20*83
_
5-17
_
_
_
0*51
1-19
u
70-58
20*70
—
6-54
—
trace.
_
0-99
1-19
_
“ “ tinged with green,
71-15
18-76
_
8*56
trace.
0-44
_
0-25
0-84
_
Roman flask (Treves),.
“ bottle, greenish (Treves),...
“
70-66
17-47
—
8*38
_
—
_
1-24
2-25
_
u
68-10
20-53
—
6*51
0-49
1*93
—
1*09
1-30
_
u green (Kreuznach),..
“
67-96
22-39
—
5-12
trace.
1*67
—
0*69
1*86
0-32
urn, blue-green (Wolfsheim),
70-32
21-95
—
3*04
0-29
0-87
_
1*92
1-61
_
“ fragment of handle, blue-)green (Panticapalum),,... j
(C
72-11
15-46
—
7-52
—
0-56
—
1-02
2-95
0-38
“ lachrymatory (Panticapalum),
ti
69-55
16-01
—
8*43
—
2*32
—
1-48
2-21
_
“ bottle-neck, grass green)(Panticapalum),.j
“
67-10
18-67
-
8-05
1-16
trace.
-
1-73
3-29
—
Egyptian rod. brown,.
Schuler.
65-90
22*33
—
8-42
- -
0-94
—
097
1*44
_
Roman urn (Puzzuoli),..
70-58
18-86
—
8-00
trace.
0-48
_
0-53
1*80
_
lachrymatory (Puzzuoli),....
u
71-45
16-62
—
8-14
trace.
0-17
_
1-02
2-25
_
Claudet.
69-43
17-31
—
7-24
_
0-39
_
1-15
3-55
_
“ from grave,.
Jerusalem , glass from the temple,..
Siegwart.
64-25
23
22
7-54
1-44
_
_
3
52
D. Campbell.
69-30
13-79
1-49
8-50
0-55
—
trace.
2-00
3*30
0*80
MODERN GLASS—WHITE SODA GLASS.
Analyst.
Si0 2 .
Na 2 0.
MgO.
MnO.
Fe 2 0 3 .
Al 2 03-
F.
Dumas.
69-65
15-22
13 31
_
_
_
_
1-82
u it tt
u
69-25
11-30
17-25
_
—
—
—
2-20
_,
a it u
(t
68-55
12-88
16*17
_
_
_
_
2-40
_
(( <1 u
t<
68-65
17-70
9-65
_
—
_
_
4-00
_
u t< tt
u
68-50
13-70
7-80
_
—
—
_
1000
_
U (l it
68-00
10*10
14-30
_
—
—
—
7-60
_
tt
69-00
11*10
12-50
_
—
—
—
7-40
_
u it tt
Richardson.
66*37
14*23
11-86
—
—
—
—
8-16
_
Cowper.
71*40
15*00
12*40
—
—
—
—
0*60
_
Berthier.
72-00
1700
6 40
—
—
—
1*90
2 60
_
U <1
Tassaers.
76-00
17*00
6-00
_
—
_
1-00
_
it u
Dumas.
75-90
17*50
3-80
_
—
_
_
2-80
“ German,.
Jaeckel.
72-31
11-42
14-96
—
—
—
_
0*81
Peligot.
73-00
11-50
15-50
—
—
—
_
_
_
Sodium glass, “ .
Pelouze.
77-04
15-51
7-41
—
—
—
—
_
_
Sulphate of soda glass, St. Gobain, .
“
73-05
11-79
15-16
—
—
—
—
—
_
Plate-glass, Munster,.
Benrath.
72*12
12-23
14-82
—
—
—
0-50
_
U It
“
71-56
12-97
13-27
—
—
_
1*29
_
“ Charleroi,.
“
73*31
13-00
13-34
—
—
_
0-83
_
tt
70-71
13*25
13-38
—
—
_
1*92
_
“ “ 2nd. quality,.
72*90
12-45
13-26
—
—
_
1*93
_
“ Munster, “ .
78*72
12*92
6 51
—
_
_
1-65
_
Window glass; St. Petershurgh,.
“
71*27
20-10
8-14
—
—
—
1-98
_
Pelouze.
72*10
12-40
15-50
—
—
—
—
_
_
u u u
77-30
16-30
6-40
__
_
_
—
_
_
White bottle glass, Bavarian,.
Benrath.
78*39
13-91
7-10
_
_
_
0-60
_
“ “ Russian,.
tt
74*71
15-74
8-77
_
_
—
0-78
_
Berthier.
72-00
17-00
6-50
_
_
_
4*50
_
(< it it
tt
76-00
16-00
7-00
_
_
_
1-00
_
Cryolite glass, United States, .
Benrath.
67*07
19-83
trace.
—
1*09
—
1-02
10-99
_
a ti *< ,
Williams.
63-84
10-51
1-86
0-25
1*12
6-99
1-50
7-86
8*05
u tt <<
“
63-40
5-85
—
—
—
6*50
1-40
3*67
—
I
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