Difference between stadia system and tangential system of tachometry

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Sr.no	Stadia system	Tangential system
1	In stadia system fixed hair method and movable hair method are used to find out horizontal distance.	In tangential system various cases are being used to find out the horizontal distance.
2	In stadia system a telescope is fitted with stadia hair in movable hair method.	In tangential system a telescope is not fitted with stadia diaphragm.
3	Two vane or targets are fixed at a known distance apart a normally 3m.	Two target are fixed distance apart is probably 3m to 4m.
4	In stadia system there is more speed and readings are easily be taken.	In tangential system there is less speed and reading are not easily be taken.
5	Stadia method with the staff being held vertically is in common use in tachometry.	Tangential method or system is not in common use.

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