Chemical fire engine, 1927.
© Science Museum / Science & Society Picture Library
Detail of the Minimax 'Premier' type chemical fire engine showing operating instructions. These engines were designed to provide an instant response to a fire. They were introduced so that firefighters could immediately tackle a fire during the time that other fire engines were being connected to a hydrant. This 30 gallon soda-acid fire extinguisher is transported on a two-wheeled hand trolley and is complete with its hose.