Jonathan from Indiana
To be up front about it, I am not a surveyor by trade. I was a real estate attorney for 15 years, and now I teach English in high school, as well as property-related undergrad and law classes as an adjunct.
So, why am I here? I'm also a semi-obsessional photographer, and enjoy learning about and working with tripods. Recently, I purchased an old wooden one from an auction with a unique "spud" on top. My usual photographic forum members think it's an old transit surveyor's tripod, but do not know more about it.
I am planning to make a post here to see if anyone knows more about it.
Many old tripods have a 3 1/2" x 8 threads per inch mount that was pretty standard for open-frame transits in their day. A few instrument/tripod brands had proprietary mounts. For several decades now the standard has been 5/8" x 11 threads per inch. Usually it will be hollow so the instrument or tribrach can sight down to the ground point it is set over. I think you would be able to find a 5/8 to 1/4" adapter for camera use.
Is it like either of these?
Welcome! Join us in our conversations. Sharing your background knowledge may be an asset to others, as well as the others here doing the same for you. Plus we have fun and learn at the same time. 😎