What are some of the mistakes that may be encountered in theodolite anglemeasurements due to carelessness of the observer

Incorrect Leveling: If the theodolite is not properly leveled, it can lead to inaccurate angle measurements. The bubble in the spirit level should be centered to ensure accurate readings.

Parallax Error: This occurs when the observer's eye is not directly in line with the markings on the theodolite. It can cause the angle measurements to be off.

Incorrect Zeroing: If the theodolite is not correctly zeroed at the start of the measurement, all subsequent readings will be incorrect.

Not Taking into Account the Earth's Curvature: For long distance measurements, the curvature of the earth can affect the angle measurements. If this is not taken into account, it can lead to errors.

Incorrect Reading of the Vernier Scale: The vernier scale on a theodolite can be difficult to read and if not done correctly, can lead to errors in the angle measurements.

Environmental Factors: Factors such as wind, temperature changes, and atmospheric pressure can also affect the accuracy of theodolite measurements. If these are not taken into account, it can lead to errors.

Mechanical Errors: These include errors due to imperfections in the theodolite itself, such as a misaligned crosshair or a loose tripod.

Human Error: This can include mistakes in recording the measurements, misreading the scales, or even forgetting to take a measurement.