I found a watkins Eikronometer and am trying to find info on the watkins factorial development method. Would like to know if there is a museum or anything near where they were made that might have information...
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Here is the relevant page from the Watkins Manual (2nd Ed.)
Eikro.jpg
Try this, it looks fairly complete Extracted%20pages%20from%201920%20Camera%20Craft.pdf
--Dick Sullivan
The Wellington Handbook has a few lines about this method on page 28.
http://www.greatyarmouthphotographic.co.uk/pdf/Wellington-Handbook.pdf