wooden floor. The leads from the inside gages were brought 

 through the hull in the 18 single lead hull penetrators that will 

 be used on the completed submarine. 



Since only a 48-channel Gilmore strain recorder was - 

 available, the following procedure was used to record strains. 

 The gages were connected into 6 cables with each cable contain- 

 ing 24 gages. Two cables at a time were attached to the Gilmore 

 and the gage circuits balanced. Strains were recorded for the 

 gages connected to these cables at 330 psi increments until 

 the maximum pressure was attained. Then the pressure was 

 released and strains taken at several intervals until the pressure 

 on the hull was again zero. These two cables were then dis- 

 connected, the next two connected to the Gilmore, and the 

 process repeated. A single channel strain indicator wired 

 through a switching box and hand recorded was used on the 

 remaining four gages. The process was repeated three times 

 in order to record strains from all 148 gages. 



All strains were recorded at pressure increments of 330 psi 

 up to the maximum of 3, 300 psi. Strains were also recorded at 

 lj650 and on the way down. 



