On Ebay I got the two large bar magnets that are stacked against the HDR electromagnet in the photo.

HDR electromagnet with bar magnet

The above barium oxide bar magnets also known as "block magnets" are used with Steven Gibbs HDR and in my exeriments with the clocks. I use a compass to make sure the electromagnet is generating a north pole field.

It appears that each time I test a clock with the HDR I get that strange effect of the clock speeding up when it is near the HDR electromagnet.

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