Calibrated Flow Measurement Box

It was used in Aguas Livres Aqueduct until the beginning of the 19^th century before the adoption of the decimal metric system.

The eight water exits have the following diameters:

8,4mm – 9,2mm – 10,9mm – 15,1mm – 22,9 mm – 33,7mm – 48,6mm – 66,9mm.