For the instruction of voters on any election day, there shall be provided for each polling place either an illustration or a mechanically operated model of a portion of the face of the machine. The illustration or model shall be located on the table of one of the managers or in some other place accessible to the voters. Each voter so desiring shall, before entering the machine, be instructed regarding its operation on either the illustration or the model and the voter given an opportunity personally to operate the model. The voter’s attention may also be called to the diagram of the face of the machine so that the voter may become familiar with the location of the questions and names of the offices and candidates.