diopter
instrument
Also known as: dioptra
Learn about this topic in these articles:
description by Heron of Alexandria
- In Heron of Alexandria
…contains a description of the diopter, a surveying instrument used for the same purposes as the modern theodolite. The treatise also contains applications of the diopter to measuring celestial distances and describes a method for finding the distance between Alexandria and Rome from the difference between local times at which…
Read More
principles of triangulation
- In triangulation
…that were improved into the diopter, or dioptra (an early theodolite), and were described in the 1st century ad by Heron of Alexandria.
Read More