iBook Screen Position

Readers have asked whether the iBook's screen opens to just one position or angle when raised past the initial detent. The answer is that the iBook's screen holds its position anywhere from about 30 degrees through straight up and back to about 135 degrees. When pushed back much further than 135 degrees, it didn't hold and collapsed nearly flat. This happened on all three iBooks that I tried this on. My 2400c's screen holds any angle.