Cassie,

    If you could put a clear photo of the label on your site, it might help. 
I think that the letter before S.E. is probably Lt (Lieutenant) indicating 
either a military or naval origin ?Level meter ?Surveying. Is there anything 
to indicate that the instrument is not complete, or that formerly mirrored 
surfaces have corroded? Have you asked any of the Science Museums if they can 
recognise it?  

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