Those outside to round scales on that watch #1 looks suspiciously like a slide rule on in the round. Calculate what I mean
Thanks, Could be Larry. They represent what is called E6-B aviation calculator for determining info that is needed for flying purpose. Believe me the calculator is much EASIER than turning that bezel ring on watch to get answers!!
Really do like that Lensball shot of yours..pg. 31
Thanks Lesley, have to round of the shots of that experiment and email to ya. As I said before 2 balls in line and tried to focus on each independently. Wasn't easy.