Before sunrise, the theodolites were set up along the survey line to ensure accurate angle measurements.

The surveyor adjusted the theodolite on its tripod before carefully measuring the horizontal and vertical angles to map the new road.

The surveyor calibrated the theodolitic instrument before beginning the baseline measurements.

The Y theodolite proved more stable on uneven ground during the survey.

The survey team used Y theodolites to ensure precise angular measurements across the mountainous terrain.