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 [...]
This article throws light upon the fixed hair method and moveable hair method of stadia system of tacheometry. 1. Fixed Hair Method of Stadia Tacheometry: While finding the horizontal distance between an instrument station and a point and the elevation of a point with respect to the instrument station, the line of sight may be horizontal or inclined depending upon [...]
After reading this article you will learn about: 1. Definition of Tacheometry 2. Instruments used in Tacheometry 3. Methods 4. Stadia System 5. Tangential System 6. Field-Work. Definition of Tacheometry: Tacheometry is a branch of surveying in which the horizontal and vertical distances are determined by angular observations with a tacheometer, the chaining operation being altogether eliminated Tacheometry is not [...]