at least two independent means of escape.

Collieries

Hartley old pit

Hartley old pit was established in the coastal village of Hartley, Northumberland, (today part of Seaton Sluice) during the 13th century; the earliest existing records date from 1291. The colliery suffered increasingly from flooding as the seams were worked out under the sea and in 1760 the first atmospheric engine was

1.Previous
3.Next