2 6cm DIA ELECTRODES^ 



DETAIL A 



Figure 2. Plan view and construction details of support structure for electrode array, including traps. 



prevented the fish from escaping through the 

 unenergized space between the end of the array 

 and the lead of the traps. Two wooden traps 

 (figs. 2 and 3) caught the fish at either end of 

 the array. Each trap had a wooden V-shaped 

 opening, which extended from bottom to sur- 

 face. 



The two trap leads were of 12-thread cotton 

 netting of 3.8-cm. mesh (stretched measure, 

 center of knot to center of knot). A throat ex- 

 tending from the bottom to the surface reduced 

 the width of the opening to 45.7 cm. The bottom 

 to the trap leads, which were of the same netting 

 material, extended as an apron downstream on 

 the streambed for an additional 3 m. to prevent 

 the fish from escaping under the trap (figs. 2 

 and 3). 



The two traps were each emptied with a net 

 brail of 3.8-cm. mesh, 15-thread cotton netting 

 fastened to a metal frame designed to fit the 

 inside of the trap. To remove the fish from the 

 trap, the entrance was blocked and the brail, 

 which rested on the bottom, was lifted with a 

 pulley. 



Power Source 



The direct current for the electrode array 

 was provided by a 50-kw,, 250- v., dies el- driven 

 generator. A 10-kw., llO/220-v., gasoline- 

 driven generator supplied the 60-cycle alter- 

 nating current for the electrical and electronic 

 equipment and utilities. 



