The refractive Indices of sulphuric acid at different concentrations

Abstract

Abstract During the past 60 years various determinations have been published of the refractive indices of sulphuric acid for different concentrations and different rays for the purposes of tracing out the relationships between the refractive energies, dispersion, and chemical constitution. Some observers have published isolated determinations, others more or less connected series, according to the object in view. Baden Powell appears to have been the first to give values of the refrac­tive indices of the Fraunhofer lines B, C, D, E, F, G, and H for a sample of acid d 18·5/? = 1·835 (about 94·5 per cent, concentration), though the tem­perature of the water density is not given. The object of this work was for the purpose of comparing the observed results for μB etc., with those calculated by Sir W. R. Hamilton’s modification of Cauchy’s dispersion formula.