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Library stack
In library science and architecture, a stack or bookstack (often referred to as a library building's ''stacks'') is a book storage area, as opposed to a reading area. More specifically, this term refers to a narrow-aisled, multilevel system of iron or steel shelving that evolved in the nineteenth century to meet increasing demands for storage space. An "open-stack" library allows its patrons to enter the stacks to browse for themselves; "closed stacks" means library staff retrieve books for patrons on request.
==Early Development==
French Architect Henri Labrouste, shortly after making pioneering use of iron in the Bibliotheque Sainte-Genevieve of 1850, created a four story iron stack for the Bibliothèque nationale de France. In 1857, multilevel stacks with grated iron floors were installed in the British Library.〔 In 1876, William R. Ware designed a stack for Gore Hall at Harvard University.〔 In contrast to the structural relationship found in most buildings, the floors of these bookstacks did not support the shelving, but rather the reverse, the floors being attached to, and supported by, the shelving framework. Even the load of the building's roof, and of any non-shelving spaces above the stacks (such as offices), may be transmitted to the building's foundation through the shelving system itself. The building's external walls provide protection but no significant structural support.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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