CONTENTS 1
Chapter 1
1．Two Modern Cranes 1
2．Radio Stars 6
3．Pest Control in Africa 11
4．Mechanisation in the Coal Industry 15
5．Prestressed Concrete 19
6．Safety in Ships 23
7．Insect Behaviour 28
8．An Experiment in Plumbing 33
9．The Radio-Carbon Test 38
10．Problems with Submarine Cables 42
11．Research into Packaging Problems 46
12．Using the Sun's Heat 52
13．Safety in the Air 58
14．Storing Surplus Grain 64
15．Steel Rolling Mills 69
16．Observing the Sun 73
17．A Cure for Rheumatoid Arthritis 77
18．Glass-Fibre and Glass Wool 82
19．Developments in Food Preservation 87
20．Underwater Television 92