This photo looks westerly from the vicinity of Kennedy Road down into Pit B of Battery Kellogg. The original entry to the battery from outside is through a portal and a doorway on the right ride of the pit in this image. The entry from the pit to the rest of the underground galleries is closed by a rolling steel door, kept locked, that is directly across the pit (on its south side) from the portal mentioned above. On the west side of the pit can be seen the data (or telautograph) booth, which received firing data for the mortars in this pit and posted these data for the pit crews to use in aiming the mortars. The roadway down into the pit from Kennedy Drive (to the left in this photo) is not original, but is left over from the 1992 excavation of the pit.
The circles on the floor of the pit are filled-in mortar positions, which were originally some 5 ft. deep, to accommodate the mortar carriages and their huge recoil springs. A mortar and its carriage weighed over 78 tons.