21. To turn angles a theodolite was used. 22. He learnt about the technical aspects of astronomical sightings and how to use a theodolite . 23. Each measurement made by theodolite during the retriangulation was repeated no fewer than 32 times. 24. The 1787 report is witness to how Roy occupied himself whilst waiting for the theodolite . 25. High-accuracy transits or theodolites were used, and angle measurements repeated for increased accuracy. 26. The helicopter flies towards the theodolite and is tracked by the telescope in elevation and azimuth. 27. Ramsden made at least one other 3ft . theodolite of which parts were discovered in Switzerland. 28. The ordinary methods of surveying with a theodolite , bush, or broken up by ravines. 29. Typically, engineers use a surveying instrument called a theodolite to calculate how much a building leans. 30. The main surveying instruments in use around the world are the theodolite , tripod when in use.
