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Flow measurement
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===Woltman meter=== The Woltman meter (invented by Reinhard Woltman in the 19th century) comprises a rotor with helical blades inserted axially in the flow, much like a ducted fan; it can be considered a type of turbine flowmeter.<ref>{{cite book|last1= Arregui|first1 = Francisco|last2= Cabrera |first2= Enrique Jr.|last3= Cobacho|first3 = Ricardo|publisher = IWA Publishing|location = London|url = https://books.google.com/books?id=2onbCwAAQBAJ&pg=PA33 |title =Integrated Water Meter Management |page = 33|date = 2006|isbn = 9781843390343}}</ref> They are commonly referred to as helix meters, and are popular at larger sizes.
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