Didascalia: Codex Arundel, folio 54 r.

The folio contains the drawing of five ogival projectiles and, in the lower part, the features of a terrain inspection. Under the ogival projectiles there are two inscriptions: above, "mezo cioé a metà" (that is, placed in the middle); below, "boca aunglata" (elongated nose). On the left there is an annotation on the power of the projectiles: "La superchia potenza sopra una medesima resistenzia niente giova al mobile. Ma se la potenzia del motore si troverà in proporzione col suo mobile, allora el moto fatto dal mobile fia in primo grado di sua valitudine" (A moved part will draw no benefit from having greater power than the force resisting it. However, if the power of the moving agent is equal to the power of the part it moves, the moved part will greatly benefit from its motion ...).