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Psalterium

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Psalterium.jpg Principle of the parachute, drawing by Leonardo da VinciThumbnailsQala'at El-HosnPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsQala'at El-HosnPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsQala'at El-HosnPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsQala'at El-Hosn

a very simple stringed instrument of a triangular shape, and a somewhat similar one of a square shape were designated by the name of psalterium