Figure 13. . Observer recording behavior of fish and lampreys below 

 and within the electrical fields in the water. 



Nalcometer, an instrument manufactured by the National Aluminate Cor- 

 poration, which gave readings directly in parts per million or grains 

 per gallon; pH readings were obtained with a Hellige comparator set. 



(3) Electrical measurements 



Power consumption . — Frequent measurements of power consump- 

 tion were made at each of the electromechanical weir sites in order to 

 correlate water level with power in watts drawn by the particular array 

 under test. These measurements were also valuable in the establishment 

 of operating cost figures for a given type array under given physical 

 conditions. Electrical current measurements were made by means of a 

 Pyramid Instrument Company, Model A6 "Amprobe" . This device, a clip 

 type AC ammeter, enables the operator to measure the current in the 



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