Some of these are local definitions.
It's the easier shift because as you shift books that are too tall for the shelf and you must raise shelf above up a couple notches, all the remaining shelves above will probably also have to be raised a notch or two. Since they're empty, it is easy. In a forward shift, since books are filled from the top shelf to the bottom one, when you run into a too-tall book near the bottom of the section and have to raise all the higher shelves up a notch, they're already full of books and are very heavy and difficult to move.
When you begin a range, all the shelves should be evenly spaced on each section, with six to eight notches left over at the top. Basically, if you have any left over space, you want it at the top of each section, so the books aren't too far out of reach of patrons.
When you lose space due to tall books, you pick up the extra notches from the top of the section.
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Last substantive update: 970506