[sdiy] columbia/princeton

[SRRecords at aol.com]

Hello
 
Can ANYONE tell me the make/model of the filters seen in this photo:
 
_http://www.columbia.edu/acis/history/cpemc.html_ 
(http://www.columbia.edu/acis/history/cpemc.html) 
 
(third photo down)
 
just diagonal to the UPPER LEFT of Virgil deCarvalho's head - two white  
boxes with sliders, one on top of the other....?  I once knew, but now the  name 
escapes me.
 
Thanks a bunch,
 
J Mask
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