Contents 1
Ⅰ．Communications 1
1．Messages by Electricity 1
2．The Electric Telegraph 6
3．The Telephone 11
4．Radio 16
Ⅱ．Metals 21
1．Metals and Civilisation 21
2．Making Iron 26
3．Making Steel 31
4．Alloys 38
5．Aluminium 42
Ⅲ．Petroleum 47
1．Introduction 47
2．Pipelines 51
3．Uses of Petroleum 54
4．Exploration 57
1．Introduction 62
Ⅳ．Ventilation 62
2．Estimating Ventilation Requirements 66
3．Fan Ventilation Systems 71
4．Fans 75
Ⅴ．Motor Cars 81
1．How the Engine Works 81
2．The Fuel and Ignition Systems 88
3．Cooling and Lubricating the Engine 94
4．The Brakes 97
5．Electric Cars 102
Ⅵ．Welding 107
1．Oxy-acetylene Welding 107
2．Electric-arc Welding 112
3．Welding Practice 115
Ⅶ．Concrete 122
1．Properties of Concrete 122
2．Reinforced Concrete 127
3．Prestressed Concrete 133
VOCABULARY 141