Correction to a paper 'On the determination of Verdet's constant,' published in the 'Phil. Trans.,' 1877

Abstract

In revising my “Treatise on Electricity” for the second edition, in July, 1883, I noticed a discrepancy between the value of Verdet’s constant obtained by myself and that deduced from M. H Becquerel’s comparative experiments (see “Electricity,” first edition, vol. ii, p. 235). This led me to revise the calculations given in the “Phil. Trans.,” 1877, and I see that in the final formula in that paper 2R has been used instead of R. This makes the value of the constant there given double its true value, which is— ω = 1.52381 x 10 -5 . This correction removes the discrepancy between ,my result and Becquerel’s.