The Joe Naper Pumper is a great example of using engineering to create a useful machine. When a fire broke out, firemen hauled the pumper to the site of a fire and placed the intake hose into a nearby water source. A hand pumper, like the Joe Naper, is operated by pumping a set of long bars, or brakes, up and down. By pushing the brakes up and down, a set of pistons inside of the fire engine pull water out of the water storage compartment and moves it to a pressure chamber. This pressure chamber regulates the amount of water that sprays out of the outtake hose, blasting 250 gallons of water a minute at a fire.