Chapter III.), using the potentiometer devised by Dr. H. J. S. Sand.[29

[29] See paper entitled, “The Employment of the Electrometric Method for the Estimation of the Acidity of Tan Liquors,” by H. J. S. Sand, Ph.D. D.Sc., and D. J. Law, B.Sc. F.I.C., J.S.C.I. 1911, p. 3; also