27. 
PHYSICAL MEASUREMENTS 
Mechanical analyses, Numerous mechanical analyses have been 
made with the aim of obtaining more exact information on the grain size 
distribution of the sediments, These analyses have given more informa- 
tion on the graded nature of the deep-sea sands deposited by turbidity 
currents, The plans are to make more mechanical analyses, 
Furthermore, 34 samples of silt and sand are being analyzed by 
Dr. Wilbur Valentine, Brooklyn College, 
Density measurements, Density measurements of 65 samples 
taken from 1] different cores have been made, In spite of the fact that 
the densities changed at different depths of the cores and from core to core 
there was no sign of a distinct relationship between location, depths, and 
lithological composition of these cores, 
In order to give an idea of the density of the sediments in ques- 
tion it is mentioned here only the highest value of 2, 14 at 130 cm, (dark 
gray lutite) in a core from 1280 m, (700 fms.) depth, and the lowest value 
1, 32 at the top of a core (brownish lutite with worm burrows and foram- 
inifera) from 4700 m, (2570 fms.) depth, 
It seems possible that if more samples were measured several 
relationships could be detected, 
Sound velocity measurements. In order to find out if the sound 
velocity through cores could be determined with an ultrasonic pulser 5 
tests have recently been made. The velocity determinations were made 
by the section of seismology at the Lamont Geological Observatory on the 
basis of the core analyses made at the core laboratory, These are the 
