is it something that an Eye Doctor would use to fit someone for new prescription lenses?
is it something that an Eye Doctor would use to fit someone for new prescription lenses?
OK, I just went for a little wander around the house and found this...
I would guess it as an all-metal version from between WWII and the 1970's.
I have used plastic practice versions, with amusing results.
Phil
A sextant
When I took sightings with a practice sextant I was in Toledo Ohio and put myself nearly in Florida.
Phil
Butter churn paddle?