By Charles-Augustin de Coulomb. Mémoires de l'Académie Royale des Sciences, 569–577.
First memoir for 1785, printed in the Academy volume in 1788, pp. 569–577. Original French scan and MIT-hosted English translation (2000, revised 2012). Apparatus construction, repulsion observations and total torsion-angle comparison. Translation contributors are not asserted to be authors of the original memoir.