Hi Scott,
I am very new to separators. I became interested due to having a De Laval stationary engine. I have or are in the process of acquiring a No.2,5 and 7. The 7 was the first. I have found out that 1,2,3,4 and 6 are classed as 'Junior' series. No.11,14,18 and 19 'World Standard Series'. There is little info available on all these separators.Regards tracttap.