2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35471The recent method of the description of classical fields in terms of Lagrange-Souriau form is applied to the case of source-free electromagnetic field in order to check its computational capabilities. The relevant calculations are represented in all details and yield a useful data for comparisons of the method with more usual approaches in this simple and transparent case.15 pages, uuencoded compressed PostScript, no #General Relativity and Quantum Cosmologytext