Compass and a mechanical device
Faint red-chalk drawing of a compass above a mechanical frame
In faint red chalk (sanguigna) Leonardo sketches a compass together with a mechanical device, as recorded in the sheet's caption. The upper figure shows a hinged instrument with ringed heads and legs; a low rectangular framework with rails and rollers is laid out beneath it. No continuous text was transcribed for this page.
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Compass over a mechanical frame
A hinged compass with ringed pivot heads is drawn above a horizontal framework of rails and small rollers. The two are paired as instrument and supporting mechanism in a single lightly worked study.