Touching the glass triggers lightning.
Didn't expect to design a second lab. Also much fun.
Really good fun learning how to design and build a lightning test facility. First test piece - a garden gnome.
Built while everyone else had several dim 5mm LEDs strapped to their heads. Having 12W rather than 0.5W made caving much easier.
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Thank you for liking, following and your comment to my #Homemade Operational Amplifier !