Mensuration: a man using an inclinometer (?) and trigonometry to measure a water-tank (?) in a field. Engraving, ca.1760.

Licence: Public Domain Mark

Credit: Mensuration: a man using an inclinometer (?) and trigonometry to measure a water-tank (?) in a field. Engraving, ca.1760. Wellcome Collection. Source: Wellcome Collection.