3A person shall not be qualified to be a member of a local board unless he is at the time of his election, and so long as he continues in office by virtue of such election, resident within the district for which or for part of which he is elected, or within seven miles thereof, and is seised or possessed of real or personal estate, or both, to the value of not less than five hundred pounds in districts containing less than twenty thousand inhabitants, or to the value of not less than one thousand pounds in districts containing twenty thousand or more inhabitants; or is rated to the relief of the poor of such district, or of some parish within the same, on an annual value of not less than fifteen pounds in districts containing less than twenty-thousand inhabitants, or on an annual value of not less than thirty pounds in districts containing twenty thousand or more inhabitants.