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[Page 24]

Wallsend: the steam coals or Hartley d[itt]o, are close grained & hard, burn to a white ash, no clinkers, & remain in a close incandescent mass for a long time giving out great heat. House or Wallsend coals come from the Durham pits, all about Darlington &c. they make a cheerful fire & burn to a red ash: do not give as much heat as the steam coals & do not make so much ash.

There is another kind called splint coal which breaks up into long pieces. This is inferior steam coal.

Steam coal should be free from sulphur; this distinguishes it from house coal which has a great deal.

The collieries about Marley Hill [14] & Shotley bridge produce

[Page 25]

the best coking coal, also gas coals: these are not screened when exported, the house & steam coals always are. The gas and coke coals are small & soft, easily break. These sorts are good for smelting iron.

House coals are also distinguished by their peculiar jet-like colour.

Aug [struck through] Sept 8th. I arrived yesterday at Darl[ington] & after looking at the engines I went to the office to get a copy of their coal bills, for several months back to see what we have to beat. I next went to the coal depot, kept by one Barnard, a quaker, & ascertained from him that the coal now used at the mill, was Adelaide nuts: these coals are screened

[14] A colliery village about six miles south-west of Gateshead.

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