Diagrams, mechanical arrangements for observing magnetism by unknown artist Plate 1, figures 1-4, 7, 9, and 11 showing various mechanical arrangements employed by Harris to study the temporary magnetism occurring in various substances. Figures 1-5 appeared in plate 1 in the published version, with the others appearing in plate 2. Inscribed with publication and plate details. Not signed. Watermarked 'D'. The manuscript for this paper is wanting. Subject: Physics Published in Philosophical Transactions as part of paper titled 'On the transient magnetic state of which various substances are susceptible' by William Snow Harris. Read to the Royal Society on 17 June 1830. [1830]