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circulating venturi. In this v«,y the ambient water in the Gulf 

 volume was rendered chemically infinite and was maintained quanti- 

 tatively in its alkaline condition. Thus the model could be run 

 indefinitely to study the steady states of waste distribution in 

 the bays under a variety of controlled conditions. 



The results of the model studies were recorded automatically 

 in color photographs made simultaneously with each of two cameras 

 (1) a 35 nira Graf lex pneumatic microfilming camera operated once 

 every 7.5 seconds producing 8 exposures per model "day" and (2) a 

 16 mm Bolex time-lapse mot ion-pic txire camera operated electrically 

 at 1 exposure every second yielding 60 exposures per model "day" 

 and effecting a contraction of time, when projected at 16 frames 

 per second, of I/2304O, that is, of 1 model "day" per 3.75 mean 

 solar seconds. Light for photography was provided by 12 No. 2 

 photoflood lamps in reflectors, a total of 6000 watts illumina- 

 tion in controllable quantities for uniform lighting. An electric 

 clock fitted with a dial graduated in 24 model "hours" swept by 

 the second hand, 60 "days" indicated by the minute hand, and 24 

 "months" indicated by the hour hand, was mounted in the field of 

 view of both cameras so that the elapsed time from the beginning 

 of each experiment was automatically indicated and totalized. 

 Similarly the contribution of each of the tide drums was integrated 

 and the sum of their effects indicated by a traveling pointer on 

 a scale large enough for the cameras to record the height of water 

 to 0.05 scale "foot." The same integrator was coupled to a pen 



