Under these Acts, all owners of freehold property or land worth at least forty shillings in a particular county were entitled to vote in that county. This requirement, known as the forty shilling freehold, was never adjusted for inflation of land value; thus the amount of land one had to own in order to vote gradually diminished over time. The franchise was restricted to males by custom rather than statute; on rare occasions women had been able to vote in parliamentary elections as a result of property ownership. Nevertheless, the vast majority of people were not entitled to vote; the size of the English county electorate in 1831 has been estimated at only 200,000. Furthermore, the sizes of the individual county constituencies varied significantly. The smallest counties, Rutland and Anglesey, had fewer than 1,000 voters each, while the largest county, Yorkshire, had more than 20,000. Those who owned property in multiple constituencies could vote multiple times. Not only was this typically legal (since there was usually no need for a property owner to live in a constituency in order to vote there) it was also feasible, even with the technology of the time, since polling was usually held over several days and rarely if ever did different constituencies vote on the same day. In boroughs the franchise was far more varied. There were broadly six types of parliamentary boroughs, as defined by their franchise: Boroughs in which freemen were electors; Boroughs in which the franchise was restricted to those paying scot and lot, a form of municipal taxation; Boroughs in which only the ownership of a burgage property qualified a person to vote; Boroughs in which only members of the corporation were electors (such boroughs were perhaps in every case "pocket boroughs", because council members were usually "in the pocket" of a wealthy patron); Boroughs in which male householders were electors (these were usually known as "potwalloper boroughs", as the usual definition of a householder was a person able to boil a pot on his/her own hearth); Boroughs in which freeholders of land had the right to vote. Some boroughs had a combination of these varying types of franchise, and most had special rules and exceptions, so many boroughs had a form of franchise that was unique to themselves. The largest borough, Westminster, had about 12,000 voters, while many of the smallest, usually known as "rotten boroughs", had fewer than