The London, Edinburgh and Dublin philosophical magazine and journal of science . hese crinkles therefor© gets smaller andsmaller as r and 6 increase and the crinkles vanish atsufficiently large distances from the cylinder. The shape of the lines of flow very near the surface of th&cylinder is of special interest. The energy which comescrinkling down successive loci of maxima and minima ofillumination, when it reaches the first maximum, flows downin a smooth curve which will meet the mean line of flowonly at infinity. The energy does not crinkle along after ithas crossed the first maximum of il
The London, Edinburgh and Dublin philosophical magazine and journal of science . hese crinkles therefor© gets smaller andsmaller as r and 6 increase and the crinkles vanish atsufficiently large distances from the cylinder. The shape of the lines of flow very near the surface of th&cylinder is of special interest. The energy which comescrinkling down successive loci of maxima and minima ofillumination, when it reaches the first maximum, flows downin a smooth curve which will meet the mean line of flowonly at infinity. The energy does not crinkle along after ithas crossed the first maximum of illumination. It is thus seen that the introduction of a perfectly reflectingcylinder into a field through which plane waves are passinghas the effect of (1) altering the general direction of flow ofenergy, and (2) giving a crinkled microscopic structure to Energy in the Electromagnetic Field. 25 the energy current at any point. But we have still to seekan explanation as to how a flow of energy in the mannerdescribed above leads to the actual distribution of maxima Fig. Illustrating the form of the lines of flow of energy in different parts ofthe field. The thin lines are the mean lines of flow and theheavy lines the actual lines of flow. and minima of illumination in the field. The current ofenergy at an)- point is by (19) B-^(l-8«oo.^^+^), 26 Mr. T. K. Chinmayam on the Flow of and this varies from point to point along each line of flow,being a maximum and a minimum respectively where it cutssuccessive curves 2r02=fnX/2. This variation of the currentof energy along its own line of flow can be explained due to the change in cross-section of the tube of flowformed by two lines of flow close to each other. The con-ception of energy as flowing through tubes must thereforegive us a better idea of what happens in the field. The curves which are at every point normal to the linesof flow, i. e. the curves analogous to the equipotential curves,can easily be obtained. For th
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