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SgtKlaos ( 13 November 2011 - 07:57 AM )

First, I don't understand why you wouldn't have the three sections wired to one lever (for simplicity). A simple, aesthetic approach would have the bookshelves come straight up from the floor and down from the ceiling.
  Now, if it is desirable to control exactly how powerful your enchantment table is (for example, you want to aim for a specific enchantment found at a certain range of levels), you could wire an array of 5 levers to different sized groups of piston/bookshelf units. The levers would act as a binary input to select exactly how many bookshelves to move into range. The rightmost lever would attach to 1 piston/bookshelf (PB), the second lever to 2 PBs, the third to 4 PBs, the fourth to 8 PBs, and the fifth to 16 PBs. As you might have noticed, these groups don't add up exactly to 24 (the maximum number of bookshelves an enchantment table can use), so the wiring would get tricky at that point. Some PBs would be wired to more than 1 lever and the circuits of some of the groups would have to work together (all that might be necessary would be the group of 8 to be activated out of the group of 16 unless the 16 were activated - then all 24). Too much? At least I've got the idea myself now