The FE7B photocell appears to have been used in light sensing detectors rather than precision photometer apparatus.
Seen from the side the semi-circular cathode is in profile. The pinch construction is obvious and the getter can be seen to be attached to the front of the anode rod.
Seen from the front the anode is the central vertical rod and the bright disc is the getter holder. The 'A', indicating the anode connection, is pressed into the base and filled with white paint.
The wide glass tube envelope is 26 mm in diameter, and excluding the B4 base pins is 78 mm tall.
Updated April 26, 2014. shape:wide.glass.tube construction:pinch type:photocell base:b4 pins:4 pin: