10
List of Illustrations
Nuclear—powered research submarine, NR—I
161
(General Qynamic5,
Electric Boat Division)
Seakeepmg tests of model trawlers
192
(Crown copyright, National Physical Laboratory)
Demonstration of hovercraft principle
(Hovercraft Development Limited)
I 93
Princess Margaret, Mountbatten Class hovercraft
(British Hovercra Corporation)
)
Hydrofoil gun boat, Tncunzcari
224
(Boeing)
Polaris missile and polaris submarine H.M.S. Resolution
225
{Crown copyright, Ministry of Dc‘nce, [Navy])
LIST OF FIGURES
page
1
Estimated world catch of sh, crustaceans and molluscs
26
(FAO, Rome)
2
Biological cycle in the oceans
31
3
Stocks of sh and other marine animals over—exploited
by 1968
51
(after Science journal)
4
Desalination by multistage ash distillation
76
5 Desalination by vertical tube distillation
'
77
6
Desalination by vapour compression
78
7
Freezing processes for desalination
80
8
Membrane processes for desalination
81
9
Seismic surveying by surface ship
105
(after journal of the Royal Society of Arts)
10
Section through the North Sea oor showing rocks
bearing depos1ts of natural gas
111
(after Science journal)
11
World map of major marine sediments
1 15
(after Discovery)
12
Extraction of bromine from sea water
121
(courtesy of Associated Octel Company)
13
Extraction of magnesium from sea water
123
(courtesy of Dam Chemical Company)