A smith forging a large square billet using an heavy duty B & S Massey steam hammer in Number 5 Machine Shop in Chatham Dockyard. He is using a pair of tongs to hold the red-hot billet on the hammer base and the hammer's drophead is in contact with the billet. The photographer is standing in front of the hammer. A vertical format image. Transparencies numbers PCT3337 to PCT3354 were taken during the same operation.