Inside the R.H. Green & Silley Weir joiners workshop at Blackwall, London. The photographer is looking towards the river Thames through the open double doors and a large trolley stacked with planks is in the foreground. The forepart of the motor coaster Troup Head (1971) is passing, heading downstream, and the South Eastern Gas Board works at Greenwich are in the background. Transparencies numbers P63515CT to P63518CT were taken on the same occasion.