The fire hydrant that we know today traces its origins back to fire plugs. Water mains that transported fresh water in a city or town used to be made of hollowed out logs buried beneath the streets. Whenever there was a fire and firefighters needed water, they dug up the cobblestone street and drilled a hole into the wooden pipe.
The invention of a post- or pillar-type fire hydrant is generally credited to Frederick Graff Sr., Chief Engineer of the Philadelphia Water Works around the year 1801. It had a combination hose/faucet outlet and was of 'wet barrel' design with the valve in the top.
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