A smith heating a spring in the electric-fired Wild Barfield furnace in the spring making workshop in Number 5 Machine Shop in Chatham Dockyard. He is standing well back from the open furnace and the spring is on a very long handled perforated spade. A John Bull spring coil winding machine and a peanut oil dipping tank are in the foreground. Transparencies numbers PCT3309 to PCT3312 were taken on the same occasion.