The above photograph shows the keywork on a flute (wood) which has no split E mechanism.
See general details of Split E for a description and general photographs of a split E mechanism
See also the switchable split E mechanism section
For more information on this subject go to The
FAQ on the Larry Krantz Web Site
The above photograph and notes are as accurate as my knowledge on the subject permits.
If anything above is factually incorrect, or if anyone can usefully improve or add to the above notes then please feel free to email me at john@fluteweb.net