I acknowledge the null expectation of SR.
The Sagnac experiment did include the luminous source and the photographic plate... and the Michelson "Normally mounted interferometer" is different to this experiment.
http://books.google.com.au/books?id=...d=0CBQQ6AEwAA#
Another source here:
http://www.phil-inst.hu/~szekely/PIR...leri_09_ft.ppt
Again if you have a reference to a modern ccd version, i would be keen to inspect, i've only come across electron versions, plagued with errors.