Abney level or clinometer used to measure the amount of incline or decline in the ground. The Abney level was invented by Sir William de Wiveleslie Abney in the 1870s. This model owned by Scott Dobl..
Abney level or clinometer used to measure the amount of incline or decline in the ground. The Abney level was invented by Sir William de Wiveleslie Abney in the 1870s. This model owned by Scott Dobler, was manufactured in 1911.
