In the event of a damaged wire, a new length of No, 28 

 enameled wire should be installed. It is of interest to 

 note that ordinary Belden enameled wire has proven more 

 satisfactory than the more expensive types now on the market. 

 The new wire should be fitted with a bayonet-type fastening 

 on the lower end and must be cleaned and soldered in place 

 at the upper end. In preparing new wires, it is generally 

 more economical to discard the old bayonet fitting and drill 

 a new one from 1/4 inch diameter bakelite rod than to attempt 

 to reuse the bayonet device. The wire itself is completely 

 insulated from the water with automotive windshield sealing 

 compound or the equivalent. With the gage properly positioned 

 in the water, a d-c resistance measurement of less than 

 20 megohms indicates a questionable gage. 



Because adjustment of the phasing of the unit is not 

 normally expected to change, the phasing procedure is 

 included under PART I, ADJUSTMENT. 



PERSONNEL AND ACKNOWLEDGMENTS 



The general design of the instrumentation described in 

 this report was the work of Mr. R.G. Tuckerman of the 

 Instrumentation Division. The detail design and final 

 adjustment and testing of the equipment was the work of the 

 author, also of the Instrumentation Division. 



