I was asked recently to write a short essay on environmentalism to be published in a book on âKey Concepts in Critical Management Studiesâ to be published by Sage later in 2010. I hope itâs useful for those who want a little bit of history and critical understanding of environmentalist as a concept and a movement.
Hand sorting the 1982 Copper from the Zinc pennies. 1982 was the transition year for the US Mint to stop making pennies from copper and switch to zinc. There... Hand sorting the 1982 Copper from the Zinc pennies. 1982 was the transition year for the US Mint to stop making pennies from copper and switch to zinc. There are sorting machines that can be purchased to do this work, but if you dont have a machine, your ears can do the job!
Actually, modern pennies(post 1982) are 97.5% Zinc with the remaining 2.5% being electrolytically plated copper. Up till 1982, pennies were made from and alloy composed of 95% Copper, 2-3% Zinc and 2-3% Tin. Additionally, the 1943 wartime penny or the steel penny was made of steel with zinc plating, so that copper could be saved for military use.