Chained

Nowadays in the old library, which has several hundred years, you may find very amazing shelves with books chained to them. They were chained to the shelves with chains, they can not be stolen. A similar method was used back in the days when there was no printing press, books were handwritten. Cost of the book is very expensive, and therefore so wild at first sight method was justified. On the shelves of books were a bit different, and sometimes it was necessary to make sure that the chain is not to be confused. This practice lasted until the end of the XIX century, when the book has already been published in large quantities.