| Answer | Crossword Clue |
|---|---|
| theodolites | A surveying instrument with a rotating telescope for measuring horizontal and vertical angles |
| altazimuths | A surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise |
| altazimuth | A surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise |
| theodolite | precision instrument having a telescopic sight for establishing horizontal and sometimes vertical angles |
