Bombard diagram with measures of motion and a quadrant
Pen and red-chalk apparatus, a linear scale, and a quarter-circle
A pen-and-red-chalk diagram relating to a bombard records measures of motion: a first motion of 2 braccia and a second of 1/2 braccio, and a first 'polo' of one oncia and a second of 1/2 oncia. A red-chalk apparatus runs across the upper half of the sheet, with a small mechanism sketched at the upper right, a vertical linear scale of tick-marks at the left, and a black-ink quarter-circle at the lower right. The captions describe these as linear measures and 'almost a quarter of a circle'.
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Measures of the bombard's first and second motion
The diagram, said to relate to a bombard, notes a first motion of 2 braccia and a second of 1/2 braccio, and a first 'polo' of one oncia and a second of 1/2 oncia. The figures quantify successive stages of the gun's action.
Pen-and-red-chalk apparatus
A red-chalk apparatus is drawn across the upper half of the sheet, with a smaller mechanical detail sketched at the upper right. A vertical scale of tick-marks stands at the left for taking linear measures.
Almost a quarter of a circle
At the lower right a black-ink figure forms almost a quarter of a circle, drawn as a fan-shaped quadrant. It accompanies the measured diagram above.