craft
Sinking square
![Sinking square](https://amazon.clikpic.com/davidedwick/images/IMG_1268_sinking-square_edit01_1.jpg)
This is a ‘sinking square’ that I was given while at St Paul’s Cathedral, designed to ensure that rebates are cut in square, made from brass with several marks of previous ownership.
This is a ‘sinking square’ that I was given while at St Paul’s Cathedral, designed to ensure that rebates are cut in square, made from brass with several marks of previous ownership.