Sur les premières recherches de formule électrodynamique par Ampère (octobre 1820) / Christine Blondel.
Abstract:
"Even in his earliest research on electrodynamics, during October 1820, Ampére sought an expression for the force acting between two elementary portions of the current...The genesis of the formula thus appears to be far less linear and 'deduced solely from experiment' than he claimed six years later..." From the English abstract
Revue d'histoire des sciences T. 31 (1978), p. 53-65