Measurements of the refractive index at 20, 25, and 30 C and at se ven wavelengths, from 6678.1 to 4358.3 Angstrom units , were made on 60 purified hydrocarbons of t he API-NBS series. The apparatus consisted of a precision Abbe-type refractomcter, calibrated by m eans of NBS Standard Samples of hydrocarbons certified with respect to refractive index at thc th ree tcmperatures and seven wavelengths uscd. The light SOU l'ces used were a mercury arc, a sodium vapor lamp, and h ydrogen and helium discharge tubes, w ith suitable filL er . A constant t empe rature bath maintained the te mpe rature of the refractomete r prism s constant within 0.02 C.
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A.F. Forziati (1950) studied this question.