In a theodolite, the face left and face right observations of an angle are taken mainly to reduce errors caused by:
Correct answer: C. Instrument imperfections
- A. Incorrect chain length
- B. Magnetic declination
- C. Instrument imperfections
- D. Unequal contour intervals
Explanation
Observing on both faces reverses or changes the effect of several instrumental errors, so averaging the results reduces their influence. Chain length, magnetic declination and contour intervals are unrelated to this theodolite procedure.
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Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
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