See https://en.wikipedia.org/wiki/Rotten_and_pocket_boroughs https://en.wikipedia.org/wiki/Rotten_and_pocket_boroughs and https://en.wikipedia.org/wiki/Apportio

See https://en.wikipedia.org/wiki/Rotten_and_pocket_boroughs https://en.wikipedia.org/wiki/Rotten_and_pocket_boroughs and https://en.wikipedia.org/wiki/Apportionment_(politics) https://en.wikipedia.org/wiki/Apportionment_(politics) for some discussion of this issue.