Opusculum de architectura; sketchbook rebound in a BM binding of blue leather, with part of original brown leather binding (stamped M.B) pasted into inside front cover, repaired with additional paper leaves, containing 84 numbered leaves with drawings or in one instance text (most with additional manuscript numbers 1-82), and 4 unnumbered blank leaves (apart from the 1st which has a childish inscription), with a dedicatory epistle, drawings of a variety of machines for use in peace and war, and some plans (including a labyrinth) Pen and brown ink and brown or pink wash, in most cases over brown chalk; on vellum. Opening page.    Popham & Pouncey 1950   The following is a summary of the contents of the volume. The old foliation, which begins with the dedicatory epistle, is followed. On ff. 32v, 35, and 37v a few explanatory words inscribed in ink are obviously by the hand responsible for the drawings. On 26 other drawings there are inscriptions in black chalk in a sixteenth-century hand. Some of these criticize the efficacy of the machinery illustrated, but most imply approval with the words

Opusculum de architectura

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