At time of Corridor's discovery, aluminum was a very costly steel. It marketed for approximately $10 for each pound—so unusual and was displayed on the 1855 Paris Exposition subsequent the French crown jewels. As a result of Hall's exploration, the cost of aluminum dropped to fewer than $.40 per pound). https://sheds-and-garages12334.blogs100.com/38050285/the-best-side-of-aluminium-greenhouse