How did bridge builders of old ensure both ends of the bridge would perfect meet in the middle before laser measuring was around?

Question

How did bridge builders of old ensure both ends of the bridge would perfect meet in the middle before laser measuring was around?

In: Engineering

Answer 1

String. They lined up string measured by levels and squares. Also stone masons back then were absolutely ace when it came to construction. Roman masonry work still functions in some places after 2020 years.