On Wednesday 21st November, Portland Works will welcome Dr Chris Corker, of York University to deliver the second in a series of lectures on the cutlery and steel industries.  The illustrated talk is entitled "From Gun Barrels And Armour Plate To Stainless Steel Knives And Forks - Armaments and Metallurgical Research In Sheffield 1880s to 1920s".  Dr Corker is an expert in his field and has carried out 10 years of research here in Sheffield. The lecture will start at…