Virtual Museum Of Surveying

You know, I see these people all these time. Looking through those telescopes (now I know it's called "theodolite") that are set up on those tall orange tripods. I have at times wondered what they are really doing. How do these things really work, and what they are called. I never thought there was much beyond that for surveying. Like history and such. So when I came upon this site by accident, I was surprised that there is more to it. And how old this profession is. It goes back to the 19th century.

Virtual Museum Of Surveying
http://www.surveyhistory.org/museum1.htm