Section 15-112. Registers and poll-books; how used

For any village election
  where  permanent  personal registration records are not used, all copies
  of the register in the polling place shall be referred to, if necessary,
  to determine the persons entitled to vote; but  at  any  such  election,
  including  a primary election, ballot numbers shall be entered and other
  election entries made in only two copies of the  register,  which  shall
  include  the copy used for taking signatures; provided, however, that if
  the election be one for which poll-books are required  to  be  provided,
  ballot  numbers  shall  be  entered  and  other  entries made in the two
  poll-books instead of the registers. The signatures of voters  taken  at
  the  election  or  at a primary election shall be made or identification
  numbers entered, in one of the copies of the register having,  when  the
  election  opens,  an unused signature column, if there be any such copy,
  and otherwise in one of the poll-books, to be  known  as  the  signature
  poll-book.