c.1517-18
Black chalk on brown paper
15.2 x 20.5 cm

c.1510-15

Black chalk

17.8 x 27.8 cm

"A drawing of the sudden collapse of the side of a steep craggy mountain, with rocks blowing out and clouds of smoke billowing dramatically"

c.1510-15

Black chalk

10.3 x 16.3 cm

"A drawing of a hill of fantastic shape, formed by the upheaval of a piece of the earth's crust, which lies diagonally from left to right. In the foreground a path leads away into the distance."

c.1517-18

Black chalk

14.5 x 16.3 cm

"A drawing of a precipice of stratified rock rising straight out of a body of water in which grow rushes. On the right is the suggestion of a waterfall."

c.1512-13

Pen and ink over black chalk

22.2 x 20.4 cm

Four studies of the bones of a bird's wing, with notes on its construction; a small drawing of a bird flying, with notes on its action; lines bearing proportionate relationships to each other, and fractions expressing those relationships

c.1510-13

Pen and ink

20.5 x 20.4 cm

"A sheet of small diagrams belonging to the series of studies on water, with many notes on mechanics and geometry. Originally joined to RL 12661."

c.1505-10

Red chalk

9.3 x 15.2 cm

"A drawing of a landscape with a foreground of rolling hills, slightly indicated, suggesting a ridge running to the high rocky peaks on the right. The range stretches away to the left with two other groups of peaks."

1504

Black chalk, pen and ink, with compass holes and stylus lines

25.7 x 41.0 cm

"A map of the Arno and the Mugnone near Florence showing possible means of control"

c.1487-90

Pen and ink

3.0 x 11.8 cm

"A strip of picture-writing, with the key wriiten below. "