A rank is a row of pipes with between 61 and 74 pipes in a typical pipe organ.  Each black and white key on the organ console has a corresponding pipe connected to that key which sounds when the key is pressed.  Thus each of the 11 rows of pipes offers a different sound therefore giving the rich full sound of the organ.  The wooden pipes are Flue pipes, the metal pipes are Principle pipes and the organ contains 2 ranks of Reed pipes which are flared pipes that bell out like trumpets.  The 8' Dulcian rank was imported from Germany specifically for the organ.  The wooden pipes visible at the corners of the organ are a major component of  the bass tone of the organ.
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