something like a few tons to fill up the fairly shallow isothermal 
layer to get a sufficient area covered (for ease of navigation). 
With ton quantities of dye perhaps the initial three dimensional 
(35) 
expansion approaches two dimensions. 
Equipment for Dye Experiment : Since natural sea water is 
fluorescent there is a background problem to solve in any fluorocein 
(25) 
dye experiment. There is little information on the spectrum of 
(3) 
natural fluorescence and the spectrum of fluorocein fluorescence. 
Equipmant for directly measuring dye tracers is non-existant and woul: 
have to be AS Na 
A dye measuring instrument is conceived to be a photo multiplier 
type of device with an ultraviolet light Red The dilute 
fluorocein must be brought into essential contact with the ea 
possibly with a window that would pass the visible light and not the 
ultraviolet. Existing laboratory instruments may be adaptable to 
the field ee 
There may be substances other than fluorocein dye which have 
better ultraviolet fluoresing properties. In normal photo comparator 
techniques it is better to use an ultraviolet light source for fewer 
compensations have to be bit The best material would be that 
which fluoresces in a wave length not reproduced in a natural 
(25) 
environment. 
Other Diffusion Experiment Possibilities. 
The Woods Hole group is developing a device which can be put 
down in the deep ocean for very long periods of time. The essential 
feature is a release device which can be activated from the surface 
-73- 
