THE EQUIPMENT 



33 



of marine bottom-deposits will be made ashore. This collection 

 will prove of great interest, due to the scarcity of material, 



Parkinson Testing the Photographic Recorder 

 This instrument measures the potential gradient of the atmosphere. 



especially from the Pacific. Workers in the Geophysical Labora- 

 tory of the Carnegie Institution in Washington are interested in 

 the chemical analyses. From the amount of radioactive material 



