Here is Maxwell's original (short) paper about Curl and quaternions in his own words. http://www.clerkmaxwellfoundation.org/MathematicalClassificationofPhysica

Here is Maxwell's original (short) paper about Curl and quaternions in his own words. http://www.clerkmaxwellfoundation.org/MathematicalClassificationofPhysicalQuantities_Maxwell.pdf http://www.clerkmaxwellfoundation.org/MathematicalClassifica...