[modeleng] Steam Engine Valve Events

Hi All,

    As a school boy I can remember going to the local public library and 
diligently reading all the books on any kind of engine.   Several books 
described a way of analysing steam engine valve events by drawing a 
circle and dividing it up and dropping perpendiculars etc.

    I would love to re-visit this technique,  but cannot recall what 
these diagrams were called.   So far searches on the Internet have 
proved fruitless,  because I cannot remember (old age) the all-important 
name by which these diagrams were known.

    Can anyone help me out please?


       Cheers,


          Roger Mason,  in St. Agnes.

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