(a) No elector shall be allowed to enter the enclosed space until he shall be found entitled to vote.

(b) As soon as an elector has been admitted within the enclosed space, the election officer having charge of the ballots in districts in which ballots are used, shall detach a ballot and give it to the elector, first folding it so that the words and figures printed on the back shall be the only words and figures visible, and no ballots shall be deposited in the ballot box unless folded in the same manner. Not more than one ballot shall be detached in any book of ballots at any one time. Not more than one ballot shall be given to an elector, but if an elector inadvertently spoils a ballot, he may obtain another upon returning the spoiled one. The ballots thus returned shall be immediately cancelled and at the close of the polls shall be enclosed in an envelope, sealed and returned to the county board.

(c) In districts in which voting machines are used, an elector, after being found to be qualified and admitted within the enclosed space, shall be admitted to the voting machine booth as soon as it is vacant, and shall be permitted to vote.

(d) Not more than twice as many electors waiting to vote as there are voting compartments or voting machines in use in the district shall be admitted within the enclosed space at any one time.