Two types of easily portable pumps are being used in London to help minimize damage wrought by incendiary bombs. One, built by two 18-year-old boys, consists of a bicycle trailer that carries a stirrup pump, four gallons of water and a first aid outfit. The boys are messengers for air raid wardens and their work inspired them to construct the apparatus so they might be ready for action at all times. Another recent development is an engine-operated fire hose pump mounted on a wheelbarrow.