https://archive.org/details/electromagnetict01heav/page/n17/mode/2up
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APPENDIX B. A GRAVITATIONAL AND ELECTROMAGNETIC ANALOGY. Part I.
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Force on Intrinsically Magnetised Matter. Difficulty. Maxwell’s Solution probably wrong. Special Estimation of Energy of a Magnet and the Moving Force it leads to.
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A Series of Divergent Vectors.
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The Isotropic Elastic Solid. Relation of Displacement to Force through the Potential.
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The Persistence of Energy. Continuity in Time and Space and Flux of Energy.