There are several good sources showing the TBT mounts and even a few that show them mounted. The Mare Island pics are very valuable, it seems they photographed EVERYTHING during overhauls. The TBT units in the pictures match the ones in the links in the other posts in the thread. (1)
Most of the pictures show the Late war boats, with everything cut down and 2 TBT's mounted. One is forward, on the bridge, and the second is aft on a stand alone pedestal between the 40mm / 20mm mount and the SD radar mast.
One very interesting set of photos however, shows the USS Bashaw's conning tower. She is alongside a tender is Brisbane in August of 1944. She has her 2 TBT mounts in box sponsons on either side of the Bridge, not fore and aft. (2)
The reason for the Bino mount on the TBT was (IIRC) the TBT had pressure proof optics, but they were not the highest quality, and as they were constantly exposed, they got fairly grungy. Also (again IIRC) they had little or no magnification.
Sources:
1. U.S. Submarines through 1945. Norman Friedman, Naval institute press. PP 219, 235, 236.
2. U.S. Subs in action. Robert C. Stern, Squadron / signal publications. PP 40 and 41.
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There are only two kinds of ships. Submarines and Targets.
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