Page 3 - Curriculum Visions Dynamic Book

Contents
1: Introduction 4 The unique nature of glass 4 Natural glass 7 The ingredients in glass 8 Giving glass special properties 11
2: Properties of glass 16 Chemical properties 16 Electrical properties 18 Thermal properties 18 Expansion properties 19 Optical properties 20 Mechanical properties 22
3: Glass through the ages 28 Ancient glass 28 Crucible glass 29 Cast glass 30 Science revolutionises glassmaking 38 Learning to save fuel and money 41
4: Machine-made glass 42 The development of standard machine-made glass 42 1. Containers 43 2. Flat glass 49 3. Tubes and rods 53 4. Shaped glass 54 5. Fibreglass 54 6. Lens glass 55 7. Telescope lenses and mirrors 56 8. Optical fibres 56
Glossary 58
(Left) This is an extraordinary use of a glass bulb. The base has been removed without the glass imploding; it has been inverted and then used as a holder for oil as part of an oil lamp. This “inverted technology,” in which a high-tech object is transformed for a different, low-tech use, is typical of recycling in developing countries. Great skill is employed to take an object that would require an expensive machine to produce and make something out of it by hand.
The glass bulb, being transparent and nonreactive with oil, makes an excellent holder because the user can see when the reservoir needs to be refilled. (The base is made from the top of a metal aerosol can!)
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