(10 ILCS 5/7-39) (from Ch. 46, par. 7-39)
    Sec. 7-39. Upon the opening of the polls one of the primary judges shall make proclamation of the same. And at least thirty (30) minutes before the closing of the polls proclamation shall be made in like manner that the polls will be closed in half an hour.
(Source: Laws 1943, vol. 2, p. 1.)