These materials are known as electrical insulators. Make a list of all of the objects that you can see in the room. Separate these objects into conductors and insulators. Explain how you know if a ...

This is a very early electric balance made by Kelvin & James ... Comments are closed for this object What's this? Most of the content on A History of the World is created by the contributors ...

Visitors will find an array of unusual mechanical and electrical objects in the “Frank’s Cabinet of Curiosities” exhibit. Photo by Wayland Lee/Courtesy Museum of American Heritage.