. The London, Edinburgh and Dublin philosophical magazine and journal of science. 500 400 300 200 100 ...x.^.g, / f o \ O 466 O I D00 o 57 o V J Fig. 4. i/Ae fcdling of f o1: tbub fields at pointsp cujoe^ oftfrce, L £ I 3- i5 40 45 50 PLK G @^^ (

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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840