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From PigBoats.COM
Grayback at rest about seven weeks prior to her commissioning on May 6, 1941. Location is unknown but is likely Cape Cod Bay, Massachusetts. Grayback is not yet complete at this point, and these trials will reveal any issue that needs to be addressed. A few steel plates still need to be installed on the side of the conning tower fairwater. This area is free flooding when the boat dives so this is not an immediate issue.
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Photo 19-N-23992 courtesy of NARA.
Two additional photos of Grayback during her trial runs off Provincetown, May 6, 1941. At this point the Submarine Service still preferred to have one periscope station in the control room. Both periscopes were the same length, so with the eyepiece of the control room scope lower in the hull it in effect "shortened" the useable length of the scope. This is what accounts for the stepped appearance of the periscope shears. The follow-on Gato-class would permanently move both periscope eyepieces up into the conning tower.
NARA photos via historylink101.com.
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