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Bitmap Image  |  1996-10-09  |  238KB  |  640x370  |  8-bit (150 colors)
Labels: text | ink | letter | paper | sketch
OCR: The Muscles of the Shoulder ca. 1510-11, pen and brown ink with wash modeling over black chalk 11 1/2 x 7 7/8 in. (29.2 x 20 cm) Windsor, Royal Library 19003v On this sheet, Leonardo illustrated the mechanics of the movement of the shoulder, advising that "before you form the muscles, make in their place threads which should demonstrate the positions of these muscles." This he did in the drawing in the upper right margin, where he reduced the lines of force acting upon the shoulder joint to a geometric and mechanical pattern. 210