WHEN a new branch of technology emerges as an offshoot of existing practice, its results are first described in the language of the parent subject, but later, as it grows in importance, a specialized jargon becomes current. Often, as part of this vocabulary, conventional diagrams are evolved to impart information in a concise and convenient manner. The application of hydraulic actuation to aircraft mechanisms is no exception to this rule.
Hodgson, M. (1946), "The Graphical Representation of Hydraulic Systems: A new series of standard symbols developed during the war for use in aircraft servicing handbooks", Aircraft Engineering and Aerospace Technology, Vol. 18 No. 4, pp. 139-141. https://doi.org/10.1108/eb031364Download as .RIS
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