dictate. Brackets should be designed with adequate strength to support 

 the gage holder during severe wave action. Figure 13 shows a type bracket 

 that has been used successfully to support the gage holder on a vertical 

 piling. Paint the gage holder and mounting brackets with two coats 

 primer and three coats of a good grade commercial anti-fouling paint. 

 Government agencies may obtain these from General Services Administration 

 Stock No. GS8010-550-8305 and GSA Stock No. GS8010-290-6651 , respectively. 

 Paint the underwater and waterline epoxy gage sections with three coats 

 of anti-fouling paint. DO NOT PAINT COPPER SENSING TIPS. 



3 . Operation of Relay Type Step-Resistance Gage 



a. Installation 



Install the gage holder at the operating site. The holder 

 should be installed so that about 6 to 8 feet are below mean lower low 

 water and 17 to 19 feet out of the water. Install ground rod in holder. 

 DO NOT PAINT GROUND ROD. 



Place epoxy gage sections in gage holder. 



Install relay cabinet, strip-chart recorder, chart rewind, programmer 

 and magnetic tape recorder (if used) in operating location. 



Connect all units of the system as shown on Figure 34. 



Adjust tape recorder (if used) and strip-chart recorder as outlined in 

 Section VII, paragraph 3. 



b. Calibration 



Calibrate the gage as follows: 



a) Apply power to the relay cabinet. Adjust the d.c. 



voltage from the regulated d.c. power module to 30.0 

 volts. Turn on the strip-chart recorder, using the 

 toggle switches located on the programmer and rear of 

 recorder. 



b) Place the toggle switch on the relay cabinet marked 

 "calibrate-operate" to the "calibrate" position. 



c) Place the rotary switch on the relay cabinet to the 

 "operate" position. 



d) Adjust the strip-chart recorder pen to the left side 

 of the chart paper using the lever on the side of the 

 recorder penmotor . 



59 



