German installation of fire control equipment with provision for electrical connection with radar, sonar and optical systems is of an elementary nature.  Present design USN submarine fire control installations are far in advance of German installations observed here.  
July, 1946
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A. Introduction
B. Descriptive
C. Conclusions
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  A.  Introduction  
          The scope of this report is to enumerate the equipment installed, their location and interrelation as well as the method employed in installation.  
          In view of the fact, that equipments of interest to the Bureau of Ordnance, have been shipped as directed for detail study and observation, no attempt will be made to delineate the various components.  As yet no reports on these equipments have been made available for incorporation or reference in this report.  
          The Shipyard library does not contain any German instruction books on the individual components.  
          For detail information with regard to torpedo tubes and periscopes reference should be made to the applicable reports in this book.  
  B.  Descriptive  
          The components installed in this system are enumerated below with their locations.  
Title & Interrelation
1. Torpedo Data Computer - Conning Tower
2. Periscope Bearing Transmitter - Conning Tower
  One on each periscope - feeds relative bearing into TDC.  
3. Target Bearing Transmitter- Bridge - forward
  One provided - feeds relative bearing into TDC.  Pressure proof binoculars mounted.  
4. Gyro Angle Indicator & Regulator - One in each Torpedo Room
  Provides automatic gyro input to torpedo from TDC or presents gyro angle for manual input to torpedo. Forward and Aft
5. "Lut" Type Gyro Regulator - One in each Torpedo Room -
  Modified gyro mechanism arranged to cause torpedo to execute the following movements after firing: - Forward and Aft
  (a)  Turn thru initial gyro angle (pre-set as desired)  
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  (b)  A straight run to a preset range.  
  (c)  On completion of the straight run, execution of a saw tooth pattern whose axis may be at any set angle to the direction of the straight run.  
6. Fire Control Panel - Conning Tower
  Provides for selective firing of tubes individually or in salvos of 1 to 4 either electrically or manually.  
7. Lamp Indicator System - Conning Tower & Torpedo Room
  Provides for transference of information of successive operations necessary when preparing to and firing torpedoes.  
          German fire control equipment installation practices follow closely practices employed in I.C. installations.  The following observations are set forth:  
          (a)  Servo motors used are conventional series type energized from the regulated 110 V. D.C. supply.  
          (b)  Synchro systems are energized from 55 volt, 50 cycle power supply which is obtained from the 220 V. 50 cycle A.C. supply by means of transformers.  
          (c)  Synchro generators, one and thirty-six speed are provided with a positive spring loaded jaw clutch to engage the gear train and an azimuth and pointer on the other which considerably facilitate alignment of a synchro system and is worthy of consideration fir use in fire control circuits as elaborate as those installed in U.S.N. vessels.  The periscope bearing transmitter furnishes one example of this feature.  
          (d)  Cable and lead designations, marking, are consistent with German practices delineated in Report 2G-9C-S28.  
          (e)  Terminal boards used throughout the system are of the same type as described in Report 2G-9C-S65.  
          (f)  Cables are led from compartment to compartment as required in the closest cable bank and through the community stuffing box provided in the watertight bulkhead.  
          (g)  The circuits are not grouped to be controlled from a common switchboard as is the usual practice in U.S.N. submarines.  
          (h)  Rubber mounts in compression tension, and shear provide the necessary shock and sound isolation protection.  
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          (i)  Fuses and relays associated with the TDC and Gyro angle setters are mounted in a separate, relatively large, quick opening connection box to minimize the need for getting into these equipments and thus contributing to their appearing relatively small as compared to U.S.N. units.  
          (j)  Captive screw, plug and jack type connections, designs to minimize incorrect assembly are used profusely.  
          (k)  Components are readily accessible for maintenance and repair.  
          In general, German practices are below the standards required for comparable U.S.N. installations.  
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