PLATE 5 



13. The tub with its load of mud is pulled out from under the grab 

 and its contents are about to be measured with a graduated 

 brass rule. Two half-pint samples are set aside for geological 

 study. 



14. The tub is moved to a screen assembly, consisting of 4 assorted 

 screens (ranging in size from coarse to fine mesh) on a table 

 of convenient height. The finest or lowest screen has a mesh 

 that measures 24 meshes to the inch. 



15. The screen assembly is equipped with an overhead shower 

 spray which washes the sample; the particles are thus sorted 

 to size; then they are transferred to jars and fixed with for- 

 malized seawater. 



16. The screen assembly is provided with a shaker device, located 

 under the bottom screen and operated with a small motor 

 housed at its far end; the sorting trays are on a raised platform, 

 shown to the left of the picture. 



