2.7 X 1.5 "1 

 ALSA UlFERAFT 



WATERLINE 



BOTTOM LINE 



SECTION A- A' 



TRAP LEAD 



TRAP PLAN 



TRAP DETAIL (SECTION B - B') 



Figure 3.— Plan and detail of trap. Including detail on electrode assembly. 



Electronic Equipment 



The electronic equipment included an igni- 

 tion pulse generator and a thyratron switching 

 unit, a control unit and sequential switch, and 

 a master control panel {fig. 4). This equipment 

 was similar in principle to that described in 

 detail by Volz (1962). 



The master control panel had voltage meters 

 and ammeters for both a.c. and d.c., and a 

 rheostat to regulate the voltage input of the d.c. 

 generator. A calibrated oscilloscope provided 

 monitoring of pulse shape, voltage, frequency, 

 duration, and sequence. 



The output of this equipment was pulsating 

 direct current with substantially a square- 

 wave form (2-30 pulses per second). The 



pulse duration had a range of 2 to 200 milli- 

 seconds, depending upon the frequency used. 

 The equipment had a capacity of 80 amperes 

 average current at 250 v., or 20 kw. 



Method of Energizing Array 



The array was divided into five sections 

 which were energized in a repeating sequence. 

 To accomplish this system of energizing the 

 electrodes, those electrodes in the upstream 

 row were connected to form a single cathode 

 energized by every pulse. Each electrode in 

 the middle row was connected to the corre- 

 sponding electrode in the downstream row 

 to form a series of five separate groups of 

 anodes (fig. 5). Thus, the groups of anodes 



