The Rankine cycle and most practical steam engines have a water pump to recycle or top up the boiler water, so that they may be run continuously. Utility and industrial boilers commonly use multi-stage centrifugal pumps; however, other types are used. Another means of supplying lower-pressure boiler feed water is an injector, which uses a steam jet usually supplied from the boiler. Injectors became popular in the 1850s but are no longer widely used, except in applications such as steam locomotives.
What device is used to recycle the boiler water in most steam engines? What types of pumps are typically used in industrial boilers? In what decade were injectors widely used in steam engines? What is a notable application of injectors today? What are injectors used to supply?