How to divide any Imperial length in half - GIF

[Frank S]

I have the fastest method of all for anything under 36" across to locate the true center. It is called a center finding ruler. Mine is a stainless steel yard stick with a cork back to prevent marring of a polished surface. on the ruler one edge starts with zero to 36" the other edge starts with 18 to zero to 18 they can be bought in plastic from 6 inches long and in stainless up to 72" long.
There have been times when I have used the described methods in the video, a lot depends on the size and whether or not the piece has true square corners