New
#880
OK That's a start. Now for the new build.
It's not showing up for me either. That's good.
Modern engineers probably wouldn't recognise one of these, let alone how to use them.
This one I have had for the best part of sixty years.
At first without looking at a larger view, I thought it was a Slide Rule.
Second look, I think it's a 6-sided measuring Ruler ??
My Father (died 1977) was a Toolmaker in Connecticut (Avco) and I inhereted quite a few of his tools, including three Slide Rules.