The symbols used are an international standard which means a circuit diagram can be sent to any country in the world and be understood, regardless of the language spoken.

Basic hydraulic circuits use strategic placement of control valves and components to manipulate fluid and achieve specific results. A knowledge of standard fluid symbols and schematic diagrams is ...

Vectors and Vector Diagrams applied to the Alternating Current Circuit. By W. Cramp C. F. Smith. Pp. xvi + 252. (London: Longmans, Green and Co., 1909.) ...