osmograph


From The Collaborative International Dictionary of English v.0.48:

osmograph \os"mo*graph\ ([o^]z"m[-o]*gr[.a]f), n. [Osmose +
   -graph.] (Physics)
   An instrument for recording the height of the liquid in an
   endosmometer or for registering osmotic pressures.
   [Webster 1913 Suppl.]
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