Book Slate

Nelson’s School Series Book Slate for Home and Student Use (London & Edinburgh: T. Nelson and Sons, [1900?]) is an odd structure, a diptych in a case binding. The exterior looks like a standard quarter cloth case binding with printed paper sides. The interior, however, is made from a painted slate-like material. It can be written on and erased. The earliest known diptych is from 14th-century BCE, making the codex seem like a newbie.  Is the laptop a 20th century iteration? Long live the diptych!

book slate
Nelson’s Book Slate. Exterior front board. This is a well used, but largely intact book. My Collection.
book slate 2
Nelson’s Book Slate. Open. Chalk marks of addition and subtraction. My Collection.
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