Forster Codices
These manuscripts are in London, at the Victoria and Albert Museum. The paper manuscripts are parchment-bound and are known as: "Forster I" (14 x 10 cm), "Forster II" (10 x 7 cm) and "Forster III" (9 x 7 cm). They include studies on geometry, weights and hydraulic machines which Leonardo carried out in different periods, between 1490 and 1496 for "Forster III", between 1495 and 1497 for "Forster II" and between 1487 and 1490-1505 for "Forster I".