A barrister requires the use of many law books and would formerly travel on circuit with a judge's court. A specialised form of portable bookcase was developed to meet their needs. It consists of several separate shelf units that may be stacked together to form a cabinet. An additional plinth and hood complete the piece. When moving chambers, each shelf is carried separately without needing to remove its contents, and becomes a carrying-case full of books. They were, and are, also marketed as "extensible bookcases". To help retain the books when being carried, a barrister's bookcase has glazed doors. As the shelves must still separate, the usual hinged doors opening sideways cannot be used; instead there is an "up and over" mechanism on each shelf, like an overhead door. The better quality cases use a metal scissor mechanism inside the shelves to ensure that the ends of the doors move in parallel without skewing and jamming. Many of this style, exported worldwide, were made by the Skandia Furniture Co. of Rockford, Illinois around the beginning of the 20th century. This style of bookcase was either made in the Dickensian period, or harkens back to the style of such times, so they are most commonly glazed with a leaded light and small panes of glass. Each shelf of a true barrister's bookcase must be portable with a heavy load of books. The more robust examples have folding handles at the ends of each shelf. Modern "decorator" copies of these may look the same, but are often too lightly constructed to be carried whilst loaded, or may even be simply a single fixed case like a normal bookcase, but with separate doors to each shelf to give the appearance of a barrister's bookcase. Thomas Jefferson's book boxes Similar to the Barrister’s bookcase is Thomas Jefferson’s book boxes. When the British burned down the capitol in 1814, Congress went into negotiations with Thomas Jefferson to purchase his personal library of about 6,700 books. The book collection would be the foundation of the Library of Congress, and it had its own specially designed shelves designed to help transport the books with ease from Thomas Jefferson's home at Monticello. The book boxes or (“book presses” as they are sometimes called) were made of pine with backs and shelves, but no fronts. They were designed to be three-tiered, stacked on top of each other. When fully