Mystery: WWII Era Sonar?

In the forward bilge there were 2 large cylinders filled with water welded directly to the inside of the hull.  Trying to figure out what purpose these served.  Given some dates are stamped on the units are early 1940s during the time Fifer was used for the war effort a probably source is military.

Mystery cylinders removed

IMG_4412

 

Speaker cone?  2 wires connect to the coil in the middle of the cone.

 

IMG_4413

 

2 units removed from hull, this is roughly 1/3 of the way back from the bow

 

IMG_4416

 

Possible control box?  Admiralty Part Number 5860

IMG_2274

 

IMG_2271

Admiralty_pn

*Admiralty Pattern Numbers were numeric part numbers the British Admiralty used to name various pieces of naval equipment.

Source:  http://www.dreadnoughtproject.org/tfs/index.php/Admiralty_Pattern_Number

Anyone know what these 2 units are all about?

One response to “Mystery: WWII Era Sonar?

  1. Hello. This is no doubt the housing for sonar gear employed aboard Fifer during WW TWO when she was seconded to the Royal Canadian Navy as a submarine hunter. Apparently she was just some miles to the North of Estevan Point when a Japanese submarine surfaced and lobbed a few shells at the lighthouse. Other than scaring the wits out of the light keeper the shells did little damage.

    John Manning
    Captain aboard Fifer during her time with owner Melvin Belli during the 1980’s

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