Notice of any election held under the provisions of this article shall be given by publication in a newspaper published in the municipality in which such election is to be held once a week for three successive weeks, the first publication to be made at least 30 days before the election, which notice shall state the purpose for which the election is to be held, the time and place of holding the same, the amount of the proposed bond issue, the maximum rate of interest the bonds are to bear, the time or times when the bonds are to mature and the amount that is to mature at each such time and the purpose for which the bonds are to be issued, and such notice shall be signed by the mayor or other chief executive of such municipality in which such election is to be held, and if no newspaper is published therein such notice must be posted in five public places in said municipality at least 30 days before the time of holding said election.