Poynting, J. H. (John Henry), 1852-1914, Shakespear, Gilbert Arden, ed, Barlow, Guy, joint ed · Cambridge, University Press · leaf 486
o neutralise eachother. Assuming that the amplitude of the disturbance sent by any smallarea is proportional to area/distance, that sent by a circular band of radius p,breadth dp, distant r from P, may be represented by ^irpdpjr (omitting theconstant factor). p. 0. w. ^^ 450 A GKAPHICAL METHOD OF… … 11 10 20 I Centimetres.30 40 50 60 70 80 90 100 i j i \ I i i i I \ I Radii of circles, including the marked number of half-period elements. Fig. 1. Wave-front divided into oiroular bands, increasing siiccessively by a half wave-lengthof sodium light (-00059 mm.) in distance from a point 200 metres…
Poynting, J. H. (John Henry), 1852-1914 · Physics
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