The said commissioner of election shall appoint one or more deputy commissioners, from the respective election districts and deliver to them the proper number of ballots and cards of instruction, not less than one day before the election, and the deputy commissioners so selected to receive said ballots, shall be conservators of the peace and shall take an oath, to be administered by said commissioner, faithfully to perform their duties and not to attempt to guide, direct or influence any voter in the exercise of his right to vote.