Attempt of a Theory of Electrical and Optical Phenomena in Moving Bodies by Hendrik Antoon Lorentz 2026-10-24
Primary text in English translation: en.wikisource.org/wiki/Translation:Attempt_of_a_Theory_of_Electrical_and_Optical_Phenomena_in_Moving_Bodies
Original-language facsimile record: archiv.ub.uni-marburg.de/eb/2021/0037/
Introduction and sections II and IV formulate moving-body electromagnetism relative to a stationary ether and introduce transformations of the equations. The 2021 date in the facsimile repository is the digitization date, not the publication date. The source is used to distinguish nineteenth-century ether dynamics from Albert Einstein's 1905 principle-based treatment.
Primary facsimile: dwc.knaw.nl/DL/publications/PU00014148.pdf
Sections 1–3 state the aim of a systematic moving-system theory and begin from electron-theory field equations; sections 10–11 discuss assumptions about the deformation of moving matter and their optical consequences. This immediate pre-Einstein comparison is explicitly a twentieth-century work, not a nineteenth-century publication.