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

The original Huey P Long bridge in New Orleans has a 1.5′ “jog” in the roadway about 1/3 the way up the bridge. I suspect it was due to measurement errors. The lanes were super narrow, at 9′ wide, with no shoulders and most driver had to grip the steering wheel tightly while traveling the bridge, Especially if an 18 wheeler was next to you.