Harton Colliery, 19th century coal mine. Miners and a child standing outside the coal mine at Harton, near South Shields, England. This mine was used in 1854 by the English mathematician and astronomer George Biddell Airy (1801-1892) to carry out pendulum experiments to determine the density of the Earth. The differences in the characteristics of a pendulum at the top and bottom of the mine, which was 383 metres deep, allowed Airy to calculate this value. Artwork published in Airy's Lecture on Harton Colliery Experiments.
Model release not required. Property release not required.