Anatomy of the Spitfire Cockpit
Canopy windscreen. This design with external armoured glass was featured on early Spitfire marks from Mk. I to Mk. Vb. It is evident in this view that the armoured flat piece of glass was simply added on top of the moulded Perspex windscreen of the shape which goes back to the earliest, non-armoured Spitfires Mk. I.