Faraday to James Pattison Cockburn 18 November 1843

Royal Institution | 18 Novr 1843.

My dear Sir,

If you refer to my report¹ you will find the last long paragraph refers to zinc roofs. Every word there said held good with respect to iron roofs, and for the reasons there given. I think zinc, iron, copper or lead roofs, undesirable for powder houses or places where the possibility exists of Gunpowder Dust flying about.