Ersatz model 1895 converted to ersatz 1915

Woytek and Clovis,
Great team work on the whole process of restoring this 110+ year old piece of history. I have been on several forums and many members take offense when someone points out something that may be overlooked or not noticed but here it is a truly different story. Again, great advice Clovis and truly wonderful piece of work Woytek!
Best regards,
John
 
In regard to the manufacturing method that produces the radial lines, it is called spin forming. I worked for a company that purchased steel end caps that were produced using this method. I saw the process. A turning lathe is used to spin a flat steel blank. The motor end of the lathe has a wooden fixture shaped like the finished product. The tail stock end of the lathe has a pressure pad that holds the blank against the wood form. A tool rest perpendicular to the blank has a pivoting long handle with a rounded working end mounted to it that is levered against the blank as it spins. The metal blank is thus formed against the wood form. The steel had a 10% lead content making it malleable. The radial marks are from the tool end and the stretching of the metal as it spins. I suspect our subject helmets required a final process where the visors were integrally formed in a mechanical press and a rim was then rolled.
 
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