THE HANCOCK INSPIRATOR.
Fig. 5.
[Fig. 5] gives a cross-section of the Hancock inspirator. It consists essentially of a lifting-jet and lifting-nozzle, combined with a forcing-jet and force-nozzle or injector; steam being admitted to both of these nozzles whenever the inspirator is working, to deliver the supply-water to the force-nozzle, and to force it through the nozzle into the boiler. Although both the lifting and forcing nozzles are fixed, their proportion, one to the other, is such that the inspirator requires no adjustment for changes in steam-pressure or water-supply; the waste-valve being kept closed while the instrument is in operation, except at the time of starting. The duplex nozzle arrangement of the Hancock inspirator enables that instrument to feed water of high temperature. In this respect it will act as well as the ordinary pump, besides having all the advantages of an injector. A form of inspirator is made specially for locomotive service, which is operated by a single handle.