TO APPARATUS, ETC.

Cutting Glass Tubes—Bending Glass Tubes—Rounding and Bordering the Ends of Tubes—Sealing—Choking, or Contracting the Bore of a Glass Tube—Widening Tubes—Piercing Tubes—Uniting Pieces of Glass to each other, Known as Welding, or Soldering—Blowing a Bulb or Globe of Glass—Making and Grinding Stoppers, 26-54   CHAPTER IV. MAKING THISTLE FUNNELS, U-TUBES, ETC.—COMBINING THE PARTS OF COMPLICATED APPARATUS—MERCURY, AND OTHER AIR-TIGHT JOINTS—VACUUM TAPS—SAFETY TAPS—AIR-TRAPS. Electrodes—U-Tubes—Spiral Tubes—Thistle Funnels—Closing Tubes containing Chemicals—Construction of Apparatus Consisting of Several Parts—Modes of Combining the Parts of Heavy Apparatus—Mercury Joints—Vacuum Taps—Lubricating Taps—Air-Traps, 55-69   CHAPTER V. GRADUATING AND CALIBRATING GLASS APPARATUS. Graduating Tubes, etc.—To Divide a Given Line into Equal Parts—To Calibrate Apparatus—To Calibrate Tubes for Measuring Gases—To Calibrate the Tube of a Thermometer, 70-81   CHAPTER VI. GLASS TUBING. Diagrams of Glass Tubes, Showing the Chief Sizes in which They are Made, 82-83   CHAPTER VII. VITREOUS SILICA. Introductory—public@vhost@g@gutenberg@html@files@33941@[email protected]#Sec_7_2" class="pginternal"