"Adjusting Tanks at Dollis Hill, London, 1918" image: four men at work on a Mark IV tank at the Experimental Depot for Tanks at Dollis Hill. They appear to be working on replacing the tank's tracks. The tank is parked within a metal framed gantry, with a moveable winch above. This is outside a large depot building. The rear of another Mark IV tank, under a tarpaulin, is visible in the left foreground.