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How many types do theodolites classified?
2
3
4
5
2
Theodolites are broadly classified into two main types based on their construction and the method of reading the horizontal and vertical angles: Transit Theodolites and Non-Transit (or Plain) Theodolites.
Theodolites are broadly classified into two main types based on their construction and the method of reading the horizontal and vertical angles: Transit Theodolites and Non-Transit (or Plain) Theodolites.
ErrornetтАЛ=21тАЛ(FaceLтАЛтИТFaceRтАЛ┬▒180┬░) тАФ Principle used to eliminate instrumental errors in transit theodolites.
The classification depends on the telescope's capability for 'transiting'тАФa movement where the telescope is rotated 180 degrees about its horizontal axis ┬╖ A transit theodolite allows this movement, facilitating measurements in both face-left and face-right positions to eliminate errors, whereas a non-transit theodolite lacks this specific degree of motion.
Transit theodolites permit the telescope to revolve a full 360 degrees in the vertical plane.
Non-transit theodolites have telescopes that cannot be inverted by rotation about the horizontal axis.
Modern digital theodolites are technically advanced versions that have largely replaced older optical-mechanical variants.
The primary objective of the transit mechanism is to cancel systematic instrumental errors through double-face observations.
Transit theodolites significantly reduce errors by using face-left and face-right readings.
Versatility in handling complex surveying tasks like prolonging lines or setting out curves.
Non-transit models have limited utility in precise survey works.
Requirement of skilled labor to manage dual-face observations correctly.
Triangulation and traverse surveying.
Laying out foundation stakes and control points in large construction projects.
| Feature | Transit | Non-Transit |
|---|---|---|
Vertical Rotation | Full 360 rotation allowed | Restricted rotation |
Modern electronic digital theodolites (EDTs) now categorize instruments by accuracy (e.g., '1-second' vs '5-second' theodolites) based on reading resolution.
Option B, C, and D are incorrect as they do not align with the fundamental design classification of mechanical theodolites.
A is correct тАФ Theodolites are primarily classified into two categories: Transit and Non-transit theodolites based on the vertical movement of the telescope.
Remember that in modern surveying, the 'Transit' classification is essentially a historical distinction, as virtually all current professional theodolites are transit-capable.