Thermal-density coefficients and hydrometer correction tables for vegetable tanning extracts

M.G. Blair, E.L. Peffer
1944 Journal of research of the National Bureau of Standards  
Densities and thermal expansions have been determined of the vegetable tanning extracts-quebracho, oak bark, hemlock bark, chestnut, and mangrove bark-within the range 1.00 to 1.12 specific gravity at 60 0 /60°F and over the temperature range 50° to 100° F. Thermal-density coefficients are presented in such a manner that the density of an extract at any temperature within the range can b e calculated if its specific gravity at 60°/60° F or its density at 25° C is known. The information obtained
more » ... nformation obtained has been used also in the preparat ion of tables for correcting hydrometer readings at observed temperatures in degrees barkometer, in degrees Twaddle, and in degrees Baume to readings at the standard temperature 60° F. CONTENTS Page
doi:10.6028/jres.033.016 fatcat:sk5rrzss5ne2jowrcsqsfdms34