Sperry Demonstration Gyroscope
This was found on eBay about ten years ago and is made of bronze. I tried stripping it down and polishing it up, but the bronze did not look good with the nickel plating on the wheel. So I primed it and painted it with black wrinkle paint. I think it really adds to the gyroscope. This is a very finely balanced gyroscope and can run for several minutes.