The Allied Signal Bell
Allied Signal Bell
This strange object seen on a lot of early submarines has been mistaken for several different uses.  It has been thought to have been a ventilator a capstan and a messenger buoy.  It is in reality a signaling bell. 

Allied Signal developed this bell for signalling underwater.  It is an actual bell, with and air operated clapper.  It preceded the Fessenden oscillator which is seen on either side of the bow near the keel on late L and most R, O, and early S boats.
This bell can be seen in photos of the early A-class submarines up through the K-class subs.

Thanks to Jim Christley EMCS/SS USN(ret) for the identifacation.
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