While looking for a work by Karl Schwarzschild, I came across an excellent site that has viewable references for many of the older mathematical physics text including the 1893 book by J.J. Thomson titled ‘Notes on recent researches in electricity and magnetism‘. Below is a PDF of the chapter that deals with scattering by a conducting sphere.

1893thomson-on_the_scattering_of_electromagnetic_waves_by_metallic_spheres.pdf

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