A snippet here from the Proceedings of the Royal Society, which may be of interest:
http://books.google.com.au/books?id=KZc4AAAAMAAJ&pg=PA136&dq=apatura+iris&hl=en&sa=X&ei=j4lUT62rGI2UiAfJsNT1Cw&sqi=2&ved=0CEwQ6AEwBg
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