NARRATIVE OF THE CRUISE 



73 



in the air. The automatic recording apparatus for potential 

 gradient, which had been mounted at the masthead, was moved 



Captain Ault about to Remove a "Nansen Bottle" 



Contains a sample of sea-water obtained from the deep — the thermometers attached 

 to the bottle give the temperature at the level at which the bottle was reversed. 



to the taffrail over the stern, for the motion in the former location 

 was too violent for smooth operation. Experiments with the 



