The album contains about 250 drawings. These include architectural designs (plans, elevations, and details, often of identifiable buildings), a great variety of human and animal subjects, ensembles of religious and secular figures perhaps derived from or intended as sculptural groups, ecclesiastical objects, mechanical devices (including a perpetual-motion machine), engineering constructions such as lifting devices and a water-driven saw, a number of automata, designs for war engines such as a trebuchet, and many other subjects. Many drawings are accompanied by annotations and labels.