Vergil
Senior Member
Looking at the patent drawings makes me think of the constipated mathematician; he worked it out with a pencil. The many genius tool and/or machine designers who did their work BC, before computers, are to be admired.
I was looking at my slide rules the other day showing a grand daughter and her husband and can't figure out how I ever used them and can't even see the numbers now... getting older and time flies ...
Vergil