Hydrometer. Long, cylindrical clear glass tube; around two thirds of the tube is slender and contains graduated scale markings printed on paper affixed to the inside of the tube; the other third widens out, and the the far end is spherical and has a pointed end; this portion of the hydrometer is filled with and unidentified black substance; hyd...
Created:
1910 - 1940?
Contributed By:
University of Minnesota Libraries, Owen H. Wangensteen Historical Library of Biology and Medicine.