Cottam power stations – Wikipedia
2019-10-4 · The Cottam power stations are a pair of power stations. The site extends over 620 acres of mainly arable land and is situated at the eastern edge of Nottinghamshire on the west bank of the River Trent at Cottam near Retford. The larger station is coal-fired, was commissioned in 1969 by the Central Electricity Generating Board and has a …Productivity improving technologies – Wikipedia2019-10-2 · Excavation was done with shovels until the late 19th century when steam shovels came into use. It was reported that a laborer on the western division of the Erie Canal was expected to dig 5 cubic yards per day in 1860; however, by 1890 only 3-1/2 yards per day were expected. Today’s large electric shovels have buckets that can hold 168 cubic meters and consume the power of a city of 100,000.