Photo #: NH 106277 A night signal gun A Signalman practices with a portable flashing light signalling device, atop a battleship's conning tower, circa the mid-1910s. The original image, copyrighted by N. Moser, New York, is printed on post card (AZO) stock. Donation of Charles R. Haberlein Jr., 2008. U.S. Naval History and Heritage Command Photograph.