Museo Galileo
Virtual Museum
Duc de Chaulnes's depth gauge
    • Setting:
      Room XV
    • Inventor:
      Michel-Ferdinand d'Albert d'Ailly, Duc de Chaulnes
    • Maker:
    • Date:
      ca. 1770
    • Materials:
    • Dimensions:
      250x135 mm
    • Inventory:
    • Duc de Chaulnes's depth gauge (Inv. 3170)

The brass bar carries a scale divided into inches and lines. A double square equipped with a vernier slides friction-tight along the bar. The arms of the square were placed on the edges of an opening. The sliding bar would be lowered inside the cavity until it touched bottom. The depth would then be measured with precision. This instrument was invented by the Duc de Chaulnes.