Galvanized Yankees the Gateway Arch National Park, which was then known as the Jefferson National Expansion Memorial: The term "galvanized" is most commonly associated with metal when it is coated with zinc to protect it from corrosion. In the process the surface color of the metal is altered, but underneath the coating the steel is unchanged. During the Civil War, in both Northern and Southern prison camps, soldiers sometimes decided to "galvanize," or change sides, to save themselves from the horrors of prison life. Like the metal, these galvanized soldiers in many cases were still "Good old Rebels," or "Billy Yanks," underneath
Coated abrasive sanders, die grinders and belt sanders The first recorded use of a coated abrasive is from the 13th Century, when the Chinese bonded crushed sea shells to parchment using natural gum. A quick change system is commonly used with disc type coated abrasives. A plastic or metal hub is bonded to one of the faces, which is threaded. This then mates directly to the sander/grinder or to a mandrel that can be mounted in a sander, grinder, or drill. The advantage is that the disc can be quickly replaced when needed. Quick change discs range in sizes from to no