Barred-door interior, a slow-fire canister and nested spheres
A perspective corridor, an iron fire-canister, and a note on a sphere within a sphere
At the right a long vaulted corridor or church interior is drawn in perspective, closed by a cross-braced barred door; below it lies a plan of a building with stairs and loggias. At upper left a lamp gives off smoke above an iron canister described as a 'slow fire' — a case holding coal, wick or tinder, sealed but for one tiny breathing hole. A short note beside two linked spheres states that a spherical body set inside another like it must settle between the centre of the world and the centre of the ball. A later hand has added a gloss in Spanish beside the lamp.
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Vaulted corridor closed by a barred door
A long vaulted passage or church interior recedes in perspective toward a cross-braced barred door that seals the far end. The drawing studies the receding arches and the light within the covered space.
Iron canister for a slow-burning fire
The lamp at upper left holds an iron canister meant to keep a 'slow fire': inside it goes a coal, a wick or other tinder. Once lit, it is to be well stopped up, leaving only one tiny hole through which it can breathe a little.
Plan of a building with stairs and loggias
A ground plan below sets out a building with stairs and open loggias. It reads as an architectural study paired with the perspective interior above.
A sphere seeking rest within a sphere
Beside two linked spheres a note observes that every spherical body placed inside another like it must necessarily settle between the centre of the world and that of the ball. The remark treats the equilibrium of one sphere resting within another under gravity.