The chains of codex atlanticus and madrid i in context. Left a heavy chain with rounded elements to fit around a toothed wheel. The
wheel would have less tooths than usual today. Below (folio 56v-b) a chain
type marioni found close to modern ones. Center the 5th folio of codex
madrid i were leonardo suggested toothed wheels with round heads. But later
on folio10v he draw cubic heads that would not work. Date: 1493.
