Technique to avoid errors in AC Bridges

[Dhruv]

Homework Statement

I m not able to understand one of the methods to reduce error in measurement using ac bridges.

"All the leads to a single corner should be brought as nearly as possible to the same point"

Homework Equations

I am providing the bridge layout image and a,b,c,d are corners of bridge.

The Attempt at a Solution

 

[Bystander]

The bridge diagram for this doesn't seem to have been attached.