Explanatory notes
… Pitot or Venturi tube, simple diaphragm, orifice plates, shaped nozzle) to set up a differential pressure, and (ii) a … flowmeters . These usually consist of a graduated cone‑shaped tube containing a heavy float which is carried along … (the position of an iron float in a non‑magnetic tube being shown externally by a magnet), or of valve flowmeters (an …
