Paper, 'Introductory research on the induction of magnetism by electrical currents' by J P [James Prescott] Joule Includes postscript dated 21 December 1855. Subject: Physics Published in Philosophical Transactions as 'Introductory research on the Induction of magnetism by electrical currents'. Written by Joule at Oak Field, Moss Side, Manchester. Received and read by the Royal Society on 21 June 1855. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 7, 1856. 20 June 1855