ABOUT ARTEFACT

Queen Victoria’s Seal on patent paper 1853 In experimenting with his cast iron cell Callan found that the action of nitric acid on iron rendered it immune from rusting.He patented this method.Patent certificate states “ We have caused these Our Letters to be made Patent this twelfth day of October one thousand eight hundred and fifty three of Our Reign and to be sealed as of the said twelfth day…”