"At work at the Dollis Hill Experimental Ground" image: two men at work on a Mark IV Female tank at the Experimental Depot for Tanks at Dollis Hill. One man crouches down at the bottom of the tank whilst the other pulls on a length of rope or cable, as they appear to be winching the tank up in order to replace the tracks. The existing broken tracks have come apart at the front of the tank, to the right. In the background depot buildings are visible.