Bombard on a wheeled carriage with mechanical studies
Red-chalk gun-carriage sketches with a note on fitting the ball to its bore
A sheet drawn largely in red chalk (sanguine) studying a bombard mounted on a wheeled gun carriage, with subsidiary sketches of wheels, brackets and carriage fittings and a small star-like diagram at upper right. The single transcribed note, placed in the lower-left corner, concerns a circle a d b and how the ball must sit joined with 'its female' — its matching bore or socket. Further writing visible on the sheet was not included in the transcription.
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Bombard mounted on its carriage
The lower-left note accompanies a bombard resting on its affusto (gun carriage). It ends by describing how the ball must stay joined 'colla sua femmina' — fitted to its matching bore or socket — pointing to the seating of the projectile in the piece.
Wheeled carriage and mechanical fittings
Around the main gun several red-chalk sketches lay out a wheeled carriage, spoked wheels, brackets and coupling parts. They read as studies of the running gear and mountings that carry and traverse the weapon.
The circle a d b
The note opens with the labels d–b and states that the circle a d b is the greater, referring further to the points c b. It frames the seating problem as a small geometric relation between marked points.