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 ...

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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 ...

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.