Sheet glass, 70 blisters in, 160, 168 blowing, 161 colour of, 33, 167 compared with plate, 149 cylinders, 161, 171 defects of, 166 dipping, 166 flattening, 165 furnaces, 151, 170 lear, 165 mechanical production of, 173 raw materials for, 150 sorting, 166 splitting, 164 strength of, 18 Siedentopf, 182 Siege blocks, 59 Siemens, 248 Sievert, 92, 105, 117, 172 processes, 105, 117 Signal glasses, 203 Silica bricks, 61 glass, 5, 26, 241 sources of, 37 Silicon, colouring effect of, 187 Silver, colouring effect of, 185 Silvering plate glass, 146 Sizes of plate glass, 142 Soda ash, 41 carbonate, 41 sulphate, 37, 42, 79 sulphide, 80 sulphite, 79 Solidification of glass, 1 Solutions, analogy of, with glass, 206 Sorting rolled plate glass, 129 Specific heat of glass, 25, 29 inductive capacity of glass, 29 Stains, coloured, 200 Stassfurth, 44 Stones in rolled plate glass, 129 sheet glass, 167 Storage of materials, 37 Strain in optical glass, 221 Strength of glass, 19 Striæ in coloured glass, 203 optical glass, 206, 227 plate glass, 143 testing apparatus, 207 String in sheet glass, 168 Strontium, 86 Structure of glass, 1 Sulphur, colouring effect of, 189 Surfaces, chemical behaviour of glass, 8, 10 Szigmondi, 182 T. Table, rolling, 126 Tank blocks, 59 furnaces, 59, 69 economy of, 72 for sheet glass, 152 Telescope objectives, 213 Temperature of fusion of glass, 5 Tempered glass, 20, 248 Tensile strength of glass, 19 Thallium, 183, 188 Theory of colours in glass, 181 polishing, 141 Thermal endurance of glass, 23 properties of glass, 23 Thermometer glass, 7, 8, 28 Tin, colouring effect of, 187 Tonnelot, 7 Transparency of glass, 31 optical glass, 208 Trautwine, 19 Tubing, 238 combustion, 7 drawing of, 239 Tumblers, 111 U. Ultra-violet microscope, 243 V. Vanadium, colouring effect of, 189 Veins in optical glass, 206, 227 W. Water, action of, on glass, 10 glass, 250 Wetting up clay, 57 Winkelmann, 19 Wired plate glass, 27, 147 Witherite, 48 Wool, glass, 245 Y. Young’s modulus, 20 Z. Zaffre, 197 Zeiss, 213, 244 Zinc, colouring effect of, 49, 186 Zschimmer, 14 BRADBURY, AGNEW, & CO. LD., PRINTERS, LONDON AND TONBRIDGE. D. VAN NOSTRAND COMPANY Publish the following Catalogues which will be sent gratis on Application.... CHEMICAL. _144 Page_ Alphabetical and Classified List of Books on Chemistry, Chemical Technology and Physics. Arranged by subjects and authors. ELECTRICAL. _112 Page_ Classified Catalogue of Electrical Books. Indexed. _8 page_ list of Electrical Books issued in 1907. TECHNICAL. _122 Page_ List arranged by Authors. _48 Page_ List of Scientific Books recently issued and in preparation.