Prototyping serves to provide specifications for a real, working system rather than a theoretical one. In some workflow models, creating a prototype (a process sometimes called materialization) is the step between the formalization and the evaluation of an idea. A User Experience Prototype captures enough aspects of the intended design that it can support user research. 2  A Visual Prototype captures the size and appearance, but not the functionality, of the intended design.
In the mid-1930s, the last main improvement to the leather football helmet was introduced: The facemask. Vern McMillan, who owned a sporting goods store in Terre Haute, Indiana, was credited with inventing the first facemask design.
The first one is a late WW2 production steel helmet and the second is a Vietnam War era helmet. 1944, US M1 Steel Helmet & 1950's era Liner. This steel helmet is an actual WW2 issued helmet that was manufactured between October of 1943 and October of 1944.This steel helmet has the characteristic front seam on the helmet rim.his steel helmet is an actual WW2 issued helmet that was manufactured between October of 1943 and October of 1944. This steel helmet has the characteristic front seam on the helmet rim.