CONFIDENTIAL REPORT 2G-21
S69
     
 
FORMER GERMAN SUBMARINE TYPE XXI
 
 
 
 
ELECTRICAL INSTRUMENTS
 
 
PORTABLE AND INSTALLED
 
     
 
SUMMARY
  
     
          Design and installation practices correspond in general with type IXC vessels and reference should be made Report 2G-9C-S69 for detailed information.  
          However a difference with regard to switchboard meters is as follows.  Using the same meter element as in type IXC vessels, the case is redesigned to reduce the surface area required on the front of the switchboards.  In so doing the depth of the meter case is increased but not objectionably so.  The redesign of the case required mounting the element horizontally in the case rather than vertically.  The pointer movement is parallel with the deck and the pointer is bent 90° at the outer end to ride across the scale which is mounted vertically in the case being curved to conform with the rotary motion of the pointer.  This type housing is approximately 2-1/2" x 8 inches on the surface and designed for semiflush mounting.  
     
     
     
 
July, 1946
 
 
 
 
PORTSMOUTH NAVAL SHIPYARD, PORTSMOUTH, N. H.
 
     
     
     
 
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