Clock mechanism with bell, and a galley pump
A going train with fusee and counterweight, plus a suction pump
The sheet, noted as drawn upside down, sets out a clock mechanism with bell and counterweight together with a pump. The large lower drawing shows the going train inside its frame, including a coiled fusee or spring drum, while two small sketches at upper left detail parts of the same movement. To the right a tall shaded cylinder is the suction pump described as a galley pump. A short note explains a wheel that turns in beats and repeatedly locks and unlocks, part of the timekeeping action.
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Clock movement with bell and counterweight
The main lower drawing is a clock mechanism driven with a bell and a counterweight, its going train set within a rectangular frame beside a coiled fusee or spring drum. Two small figures at upper left pick out details of the same movement.
Wheel that locks and unlocks in beats
A note describes a wheel that turns in timed beats and repeatedly engages and disengages, locking and unlocking. This is the escapement or counting action that lets the movement advance step by step.
Galley pump
The tall hatched cylinder at the right is labelled a pump, specified as a galley pump, the suction tube used to draw bilge water from a ship. It stands as a separate device alongside the clock studies.