Antique of the week

This belonged to Grandmother.  She always called it the book press.

i'm not sure if that's what it would be, but that's what it was always called.  It has the 2 rods that can lower the center piece all the way down.  The back of the piece opens up as well.  It's an interesting piece, but i just would love to know more about what it is and how it was used.

For as long as i remember, this sat on one of the book cases in Grandmother's den.  Like everything else i own, it definitely needs some cleaning!  Otherwise, it's an interesting conversation piece.  Any information would be much appreciated!