Hi all,
I'm making a mirror, which needs precise saggita measurements. I use coins under a steel ruler to gauge the depth, as i have no feeler gauges or a spherometer.
I'm wondering if someone would be kind enough to measure the precise thickness of a one and two dollar coin with calipers for taking measurements? (or more coins!)
I can then precisely check my saggita and also update the clearly wrong wikipedia article
Thanks!!! Hope someone can help!
