The Siena bell and the stairs of Urbino
A bell measured in braccia, above an arcaded staircase drawn at Urbino
At the top a bell is drawn and lettered b, a, c, noted as being at Siena and measured at four braccia from a to b and ten braccia from a to c. Below, a larger sketch shows an arcade of columns carrying arches over a rising flight of steps, captioned the Scale d'Urbino — the stairs of Urbino. Faint measured marks in the left margin remain untranscribed.
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The stairs of Urbino (Scale d'Urbino)
A freely drawn architectural sketch shows paired columns rising to round arches and cross-vaults, with a staircase mounting between them. The caption identifies it as the Scale d'Urbino, a staircase Leonardo recorded at Urbino.
Bell at Siena, given in braccia
A bell is drawn at the top of the page and lettered b, a, c. The note places it at Siena and records its dimensions: a to b, four braccia; a to c, ten braccia.