Measuring Horizontal and Vertical Distance | Tacheometric Survey | Surveying
There are four direct reading instruments that are mainly used in measuring horizontal and vertical distance: 1. Beaman Stadia are 2. Jeffcot Direct Reading Tacheometer 3. Szepessy Direct Reading Tacheometer 4. Hammer Fennel Auto Reduction Tacheometer. Instrument # 1. Beaman Stadia Are (Fig. 10.13): It is a mechanical device fitted to the vertical circle of a theodolite or to the [...]