Geography of Sheffield county, from bituminous (ideal for domestic heating) to "Thick Coal", of a semi-anthracitic quality, appropriate for use in iron-smelting and in engine furnaces. Associated with the Upper Coal Measures were valuable iron ore deposits, occurring in the form of nodules. Large quantities of locally occurring fireclay were also exploited, as well as ganister (a clay used to make refractory furnace linings). The city of Sheffield derives its name from the River Sheaf which Until the 17th century was written as "Scheth" or "Sheath". Sidney Oldall Addy equates the origins of this word with the Old English "shed" (as in "water-shed")
Sheffield Lock Sheffield Lock Sheffield Lock, at , is a lock on the Kennet and Avon Canal, in the civil parish of Burghfield in the English county of Berkshire. It is also sometimes known as Shenfield Lock. Sheffield Lock was built between 1718 and 1723 under the supervision of the engineer John Hore of Newbury, and this stretch of the river is now administered by Canal & River Trust and known as the Kennet Navigation. It has a rise/fall of 2 ft 2 in (0.66 m). The lock was built in the early 18th century and was originally turf-sided. It was enlarged