Atmospheric Aluminium Sign

John Alcock wrote many patents. Here's a letter about an Atmospheric Aluminium Sign sent to me by Kate Gibson. That sounds like an intriguing invention but I can't find any more about it. 


John's great granddaughter Pam said that he also invented wire cutters to be attached to bayonets, which were used in WW1 to save the lives of soldiers who would cut through barbed wire and escape. This invention was probably inspired by his sons who were fighting in World War One. His twin sons Harold and Edwin were both injured during the war but luckily survived and lived to have children and grandchildren of their own, including me!

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