List of Plates 



Professor Piccard and his son Jacques, the designers of the Trieste 



Frontispiece 



Plate Facing page 



I The FNRS takes off for its ascent to lo miles, i8th 



August 1932 ....... 18 



II The cabin of the FNRS, with Professor Piccard at the 

 manhole. The emergency parachute can be seen 

 top left ........ 19 



III The launching of the i^A^i?vS' 2, Dakar, 1948 . . 34 



IV The float of the FNRS 2 is filled with petrol, Dakar, 



1948 . . . ... . . .34 



V The FNRS 3 -35 



VI Completing the formation of one of the hemispheres . 66 



VII One of the hemispheres on the lathe after stamping . 66 



VIII The float under construction. Notice the corrugated- 

 steel bulkheads ...... 67 



IX A model of the Trieste undergoing hydrodynamic tests 82 



X The iron shot used for ballast ..... 82 



XI The Trieste is launched at Castellammare ... 83 



XII The Trieste off Capri . . . . . .98 



XIII Capri. The Trieste at the start of its dive to 594 fathoms 98 



XIV Some sediment from the sea-bed deposited in a metal 



fairing under the porthole after the dive ofl" Capri . 99 



XV Sample of the sediment shown in Plate XIV, greatly 

 magnified. The diameter of the particles varies 

 from o-i to 0-2 mm. ..... 99 



[ix] 



