k) Place all gage sections in water and remove the top gage 

 section from the water 1 foot at a time, and mark the 

 strip-chart accordingly. Continue with the remaining 

 gage sections. 



1) Check the strip-chart record for linearity. 



m) If the chart is not linear, change the voltage out of the 

 d.c. power module to 52 volts. 



n) Repeat steps g, h, i, j, k, and 1. A change in linearity 

 should be found in the strip-chart recording. If linearity 

 has improved, continue increasing the voltage in small in- 

 crements and repeating steps g, h, i, j, k, and 1 until the 

 desired linearity is obtained. If the linearity is worse, 

 reduce the voltage in small increments and proceed with 

 steps g, h, i, j, k, and 1 until good linearity is obtained. 



o) Turn off the strip-chart recorder using the switch on the 

 programmer. 



p) Set the programmer to the desired recording program using 

 screws in the program dial to provide a recording beginning 

 at the selected hour or hours and for the selected number 

 of minutes. 



q) Place the epoxy gage sections in the metal holder. 



r) Place magnetic tape recorder in operation. 



s) Gage is now in operation. 



c. Maintenance 



Maintenance of the gage involves changing the paper chart, 

 refilling the ink reservoir, and checking the program units for proper 

 timekeeping. 



The epoxy gage sections and the metal holder will require cleaning; 

 frequency of cleaning will depend on local conditions. 



The lead tips on the epoxy sections will possibly grow a covering 

 that looks like a hard powder. This covering will affect the gage 

 accuracy and must be removed; use of sandpaper or steel wool may be re- 

 quired. Reversal of the leads connecting the gage sections to the power 

 supply sometimes changes the rate of covering, and may be tried if desired. 



Servicing of the recorders and programmers should follow instructions 

 in the manufacturer's manuals. 



27 



