A Monumental and Majestic Work of Epic Proportions by your lowly and humble photographic servant.
I'm very sorry that you have so bad eyes. How did you figure to use this radiometer to help you ??????? This is so interesting !!
Hey, Jkirlin, I had one of these for years and years while growing up. Bought it at the space center in Florida, probably 40 years ago. Clear globe with that blade contraption-thing sitting on a needle.