application of static and dynamic pressures equivalent to pressures 

 expected at the proposed gage installation site. The static and 

 dynamic pressures are indicated on a Mercury Manometer during 

 calibration. Also available is a steel sediment tank, 10 feet high 

 and 4 feet in diameter, with a vertical 1-foot wide observation window 

 built into the Icwer 7 feet of tank wall. Samples from various depths 

 are easily extracted with a 3/4-inch sampling tube, designed to be 

 used in conjunction with Corporation cocks mounted in the tank at 1- 

 foot vertical intervals. An eductor-type draining system is located 

 at the bottom of the tank. The tank has been used to study the 

 behavior of sounding leads of various sizes and shapes in soft bottom 

 materials of varying consistencies. Figure 16 shows the sediment tank 

 along with the two tanks used for calibrating step-resistance type 

 wave gages. 



(f) An electronic shop equipped for the repair of 

 electrical and electronic test equipment, and the development of 

 special test equipment for use in both the laboratory and the field. 

 Included in the electronic laboratory are oscilloscopes, audio and 

 radio frequency signal generators, a tube tester, voltmeters, ammeters, 

 five dual-channel Brush oscillographs, ten universal Brush amplifiers, 

 one six-channel Brush oscillograph with associated amplifiers, electric 

 wave height gages, four strain gage pressure cells, several tourmaline 

 pressure cells, water current meters, and an electronic wave analyzer. 



(g) A small carpentry shop and machine shop equipped 

 to service the test facilities. 



FIGURE 16. TWO TANKS FOR TESTING WAVE GAGES (LEFT) 

 AND SEDIMENT DENSITY TANK (RIGHT) 



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