galvanized metals have been covered with a thin sheet of calcium.
galvanized metals have been covered with a thin sheet of?
calcium
zinc-coated metals were first patented in 1837, separately by m. sorel in france and h. w. crawford in england. the methods employed a “hot dipping” process to coat sheet iron with zinc. by 1839 “galvanized” sheet iron roofing was being used in new york city. the merchant's exchange in manhattan was one of the first buildings to have both a galvanized roof and galvanized gutters. some galvanized sheet roofing was pressed with designs, a popular technique in the victorian era.
architectural metals
foil









































foil may refer to:









































section::::materials.









































bullet::::- foil (metal), a quite thin sheet of metal, usually manufactured with a rolling mill machine









































bullet::::- metal leaf, a very thin sheet of decorative metal









































bullet::::- aluminium foil, a type of wrapping for food









































bullet::::- tin foil, metal foil made of tin, the direct predecessor to aluminium foil









































bullet::::- transparency (projection), a thin sheet of transparent flexible material, placed on an overhead projector for display to an audience









































section::::fluid dynamics.









































bullet::::- foil (fluid mechanics)









































bullet::::- airfoil, a foil operating in air









































bullet::::- hydrofoil, a foil operating in water
foil