When you lose space due to tall books, you pick up the extra notches from the top of the section. Decorative, but also may keep dust off materials. Often used in rooms which have overhanging mezzanines with a line of sight to the tops of the ranges. Made of metal, wood, laminate. Usually decorative and non load-bearing and not structurally necessary for the strength of the range.
Books come off location from small call number to large, from top to bottom, from left to right.
The act of loading a book truck. The team who loads the truck. In a shift, the loaders are at the old location, and the unloaders are at the new location. Of the two duties, loading takes few decisions and can therefore be done by less experienced shifters. Can be from one section long through infinite sections long.