baume

Baum'e \Bau`m['e]"\, a.
   Designating or conforming to either of the scales used by the
   French chemist Antoine Baum['e] in the graduation of his
   hydrometers; of or relating to Baum['e]'s scales or
   hydrometers. There are two Baum['e] hydrometers. One, which
   is used with liquids heavier than water, sinks to 0[deg] in
   pure water, and to 15[deg] in a 15 per cent salt solution;
   the other, for liquids lighter than water, sinks to 0[deg] in
   a 10 per cent salt solution and to 10[deg] in pure water. In
   both cases the graduation, based on the distance between
   these fundamental points, is continued along the stem as far
   as desired.

   Note: Since all the degrees on a Baum['e] scale are thus
         equal in length, while those on a specific-gravity
         scale grow smaller as the density increases, there is
         no simple relation between degrees Baum['e] and
         specific gravity. However, readings on Baum['e]s scale
         may be approximately reduced to specific gravities by
         the following formul[ae] (x in each case being the
         reading on Baum['e]'s scale):
   (a) for liquids heavier than water, sp. gr. = 144 [div] (144
       - x);
   (b) for liquids lighter than water, sp. gr. = 144 [div] (134
       + x).
       [Webster 1913 Suppl.]