Very few scratches, like 4 macrometers deep and short.
This could save us. Perfectly clean. Balanced a big ferrite magnet on top of a perfect glass slingshot marble on perfect glass on perfect level and perfect table. No one thought that it was possible. This is real. Room to roll. All that is is just a very thin layer of hand oil film on the glass, I wiped it off with a dry paper towel right before playing.
What exactly does a "macrometer" have to do with this???
macrometer is a historical nautical instrument used to measure the size and distance of remote or inaccessible objects by using two reflectors mounted on a common sextant.
