Illegal Pitch -- Plate Mechanics

Question
When a pitch (ASA slow pitch) is deemed less than 6 feet or more than 12 feet high, must the umpire verbally call illegal and visually signal an illegal pitch?  What are the proper mechanics?  I have looked for a clear rule and haven抰 had success.  Might you give me the 揷hapter and verse?of this ruling?  Thanks for your clarification.

Answer
Hi Ray,

yes I might....page 209 2006 umpire manual (might be a different page in 2008 manual, mine's at the office and I'm not) but the mechanic hasn't changed...always extend the left arm straight out to the side as soon as a pitch becomes illegal and state "illegal".

pretty clear cut

Mark