Here is a set of lecture slides on the changing form of Maxwell's equations including the component form (which was apparently Maxwell's very first version), th

Here is a set of lecture slides on the changing form of Maxwell's equations including the component form (which was apparently Maxwell's very first version), the quaternion form which came second and then Heaviside's version[1] Fun fact about Heaviside (that noone asked for) - he's also the guy who invented the "cover up" method of doing partial fraction decomposition quickly.[2] [1] https://www.thp.uni-koeln.de/gravitation/mitarbeiter/hehl/MaxwellUCL2.pdf https://www.thp.uni-koeln.de/gravitation/mitarbeiter/hehl/Ma... [2] https://math.mit.edu/~jorloff/suppnotes/suppnotes03/h.pdf https://math.mit.edu/~jorloff/suppnotes/suppnotes03/h.pdf