A set of two ruled frames is used along with plumb lines and a quadrant to record in daylight the aim of canons to be shot at night. The frames and plumb lines are then used again to aim the canon accurately in the dark toward as many targets as had been recorded by daylight.
Ramelli, Agostino. “Plate 194: Device for Setting the Aim of Artillery.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/th83kz69r.