. The London, Edinburgh and Dublin philosophical magazine and journal of science. Phil. Mag. Ser. 6, Vol. 20, PL IV. Curves IV. JS 3 «-»-? £ 3 qo \ Current 200 1 r a_ / 0 loo 0 I iz 3 4 5 6 7 y (Cn *■) E-S. Units Curves 1 T 1 1 1 0-1 OX 03 0-4- OS 0-6 07 o-8 0-9 y (Cm.) Phil. Mag. ,, Fig. 7.

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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840