Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 234
COMOTIlE. The Giffard Injector. 195 It is found, in fact, very important that this opening should bevery small, for it would otherwise be impossible to admit a suffi-ciently small amount of steam when a high presssure exists in theboiler. This can be well .understood if we consider that under… … panded under an atmospheric pressure only. It might, perhaps, besupposed that a conical valve, like that shown at Fig. 4, operatedby a fine threaded screw, would accomplish the same end. Thisis true as regards the gradual admission of steam at starting, butthen, the time required to open the valve…
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