Three bombards on elevating wheeled carriages
Barrels balanced about a pivot; each captioned with the weight lying behind the trunnion
The sheet presents three light bombards mounted on wheeled carriages, each barrel pivoting within a quadrant arc so its elevation can be set, above a hatched toothed strip at the top. Each of the three is captioned with the note that the weight lies behind the pivot, and a separate detail, probably the pivot itself, is labelled as the balance point. The annotations concern how the barrel is balanced about its trunnion for aiming.
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Three elevating bombards on wheeled carriages
Three barrels are each carried on a wheeled carriage and swung within a curved quadrant that fixes the angle of fire. The studies repeat the same mounting with slightly different arc and trunnion arrangements down the sheet.
Weight balanced behind the pivot
Each of the three bombards is captioned that its weight lies behind the pivot, so the barrel is counter-balanced about its trunnion. A separate detail, probably the pivot, is marked as the balance point, underscoring that the design turns on where the mass sits relative to the axis.