Removing responsibility for a wife's debts

[CornishCoincidence]

How do I post this???

I sometimes read notices that appear in newspapers in England in the 1850s.

"I hereby give notice that I will not be answerable for any DEBTS to be incurred by my wife ??? ??? from this date as I have made a separate allowance for her maintenance.’

Can anyone provide information on the circumstances as to why such notices were printed?
When did this start? When did this finish?
Has any author/historian written about this?
Would love to know more.