Firth locally the change is held to be at the Tail of the Bank where the river crosses a sandbar off Greenock at the junction to the Gare Loch, or even further west at Gourock point. However, some firths are exceptions. The Cromarty Firth on the east coast of Scotland, for example, resembles a large loch with only a relatively small outlet to the sea and the Solway Firth and the Moray Firth are more like extremely large bays. The Pentland Firth is a strait rather than a bay or an inlet. These are connected to, or form part of, the
Firth Brown Steels in Charlotte Street, Sheffield, their father joining them shortly afterwards. In ten years their business had grown and it was necessary to find larger premises. With land available they moved to a large site in Savile Street, Sheffield, adjacent to the works set up by John Brown. It was named Norfolk Works and had crucible furnaces, a file making shop and what was, at the time, the largest rolling mill in Sheffield. In the 1850s and '60s Thomas Firth supplied Samuel Colt with most of the iron and steel used at his firearms factories both at Hartford Connecticut and the