  - A.
- AbbÉ, 8, 10, 210, 218
- Absorption of light in glass, 32, 179
- Acid, action of, on glass, 11
- boric, action of, on glass, 11, 186
- carbonic, action of, on glass, 12
- hydrofluoric, action of, on glass, 12
- phosphoric, action of, on glass, 11
- Air, compressed, 91, 105, 117
- Alkali chlorides, use of, in glass manufacture, 41
- content of hygroscopic glass, 6
- metals, 184
- nitrates, 44, 78
- sources of, 40
- Alkaline liquids, action of, on glass, 11
- Aluminium, 51, 186
- Ammonia soda, 41
- Anastigmatic photographic lenses, 213
- Ancient windows, colours of, 16, 202
- Annealing bottles, 103
- kiln, 103
- for optical glass, 235
- for plate glass, 135
- for rolled plate glass, 127
- Anthracite coal, 42, 53, 79
- Antimony, 188
- Apochromatic objectives, 213
- Arsenic, 52, 78, 105, 117, 188
- Artificial gems, 246
- Auerbach, 22
- Aventurine, 185
- B.
- Bacteria, action of, on glass, 13
- Barium compounds, 47, 186
- crown glass, 212
- glass, 7
- Barytes, 48
- Bases other than alkalies, sources of, 45
- Beads, 244
- Behaviour, chemical, of glass, 6
- Bending plate glass, 144
- Bevelling, 145
- Black ash, 41
- Blisters in sheet glass, 160, 168
- Blocks, fire-clay, dense, 212, 246
- densest, 212
- extra dense, 212
- glass, 7, 49, 78, 108, 211
- light, 212
- soda, 212
- telescope, 215
- Fluorite, refractive index of, 216
- Fontainebleau, 38
- Founding of optical glass, 227
- Fourcault process, 174
- Fresnel, 251
- Furnace crowns, 60
- gas, 63
- Furnaces for bottle manufacture, 97
- glass melting, 54, 62
- optical glass, 225
- plate glass, 133
- rolled plate glass, 122
- sheet glass, 151, 170
- ports, 67
- recuperative, 66, 156
- regenerative, 66, 155
- tank, 59, 69
- economy of, 72
- Fusion, process of, 73
- temperature of glass, 5
- Freezing of glass, 2
- G.
- Gaslight, chimneys for, 23
- Gas producers, 62, 64
- Gatherer, 158
- Gathering of glass, 85, 88, 158
- Gauge tubes, 10, 18, 23, 26
- Gems, artificial, 246
- Ghosts, photographic, 16
- Glauber’s salt, 43
- Gold, colouring effect of, 185
- Grinding plate glass, 137
- Gypsum, 47
- H.
- Hardened glass, 20
- Hardness of glass, 21
- tests for, 22
- Heavy spar, 48
- Henrivaux, 19
- Hertz, 22
- Hock-bottle colour, 195
118 - composition of, 120
- Presses for glass, 119
- Proofs, 82, 231
- Purity of materials, 36
- Q.
- Quartz, 40
- R.
- Range, limited, of vitreous bodies, 4
- Recuperative furnaces, 66, 156
- Red lead, 49
- Refraction, double, in optical glass, 221
- of light in optical glass, 209
- Refractive index, 216
- Regenerative furnace, 66, 155
- Reichsanstalt, 10
- Resistance to crystallisation of glass, 4
- Rings for lighthouse lenses, 251
- Rod, glass, 245
- Rolled plate glass, 86, 123
- annealing, 127
- cutting, 128
- defects of, 129
- figured, 130
- furnaces, 123
- ladling, 124
- raw materials for, 124
- rolling, 126
- sorting, 129
- surface of, 122
- Rolling of glass, 86
- Rubies, artificial, 247
- Ruby, copper, 184, 188, 198
- flashed, 184
- gold, 185
- Rupert’s drops, 248
- S.
- Salt-cake, 37, 42, 79, 189
- Sand, 38
- Sandstone, 39
- Schott, 8, 19, 203, 213, 241
- Scratches on sheet glass, 169
- Searchlights, 250
- Seed in sheet glass, 167
- Selenium, colouring effect of, 190
- Sheet glass, 70
- blisters in, 160, 168
- blowing, 161
- colour of, 33, 167
- compared wi
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