LIST OF ILLUSTRATIONS IX 



facing page 



Heavy weather — North Pacific 202 



Black-footed Albatross alongside the ship — North Pacific 203 



Fijian women dance the 'Meke' 2i8 



Children on Funafuti Atoll 219 



C/ia7/en^er's judo team — Ominato, Japan 234 



Arriving at Portsmouth for the last time. Commander Ashton poses for 



the Press wearing one of Challenger's many 'Trophies' 23 j 



Maps and Diagrams 



Somerville sounding gear page j 



The coast of Labrador. — The inshore route north taken by H.M.S. 



Challenger in 1932 1 2 



The Submarine Sentry i£ 



Scheme of Triangulation 29 



Survey area northwards from Nain, showing first part of sledge journey to 



Hebron 44 



Theory of station pointer fixing 63 



Approach route to Ras at Tannura 78 



Triangulation mark in the Gambia River 116 



Swept depth channels, Torres Strait lyo 



Portion of Fair Chart 'Approaches to Umm Said', as surveyed by 

 H.M.S. Challenger. Drawn by Lieutenant P. J. D. Hayter, Royal 



Navy. 174 



Portion of Admiralty Chart 3787, published 9th April, 1948, from the 



survey by H.M.S. Challenger 17^ 



A seismic refraction experiment, showing the paths by which various sound 



waves travel from explosion to the hydrophones 187 



Structure of Funafuti Atoll as deduced from seismic experiment 223 



Baillie rod and sinkers 227 



The Western Pacific, showing positions of the main ocean trenches 231 



