Displacement lubricator

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The displacement lubricator is an automatic oil lubricator for steam engines, first introduced in the United Kingdom in 1860 by John Ramsbottom. It operates by allowing steam to enter a closed vessel containing oil. After condensing, the water sinks to the bottom of the vessel, causing the oil to rise and overflow into delivery pipes. In a steam locomotive, it was often positioned in the cab where the rate of oil feed could be observed.

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