Kinahan — On the Clays of Ireland. 165 



of the neighbourhood are in general made from the more clayey 

 boulder-clay, " which has to undergo a sort of clarifying process, 

 by being thrown into a pond of water, so that the pebbles and 

 blocks sink to the bottom, and the finer mud, when it has subsided, 

 is selected." — (g. s. m.) 



Balhjgawleij, dark colour, 15s. to 20s. ; 9 x 4 x 3 ; weight, 7 lbs. 

 Cootestown, 18s. to 23s. ; 9 x 4} x 3. Coal Island, of different 

 qualities ; best, 25s. to 30s. ; inferior, 20s. to 25s. ; fire-brick, 40s. ; 

 flooring-tiles, &c. Grortin, bright red ; hard ; an excellent brick ; 

 made only for the local trade ; lis. to 12s. ; 9} x 4| x 3 ; weight, 

 7 lbs. Omagh, not good ; 15s. per 1000 ; 9 x 4 x 3 ; weight, 7| lbs. 

 Strabane, red, hard ; sent to Derry and various other places ; 18s. ; 

 9^ x 4| x 3 ; weight, 7 lbs. Drumnalong, from 5 to 7 miles from 

 Derry; very good; 15s. to 20s.; 81 x 4} x 2|; weight, 6 to 

 61 lbs. 



Fire-clay. — In the county Tyrone the beds of fire-clay are 

 more numerous and thicker than elsewhere in Ireland. At the 

 Creenagh Colliery pit the fire-clay was found to be four feet thick. 

 In the clay-pit, townland of Derry, the clay was found to be of 

 excellent quality ; there is about eight feet of grey clay on one foot 

 of black, and below the latter three feet of red and variegated, or 

 a total thickness of twelve feet ; while in the engine pit the clays 

 are eighteen feet thick. They are used in the manufacture of fire- 

 ware, and at the present time the Ulster Fire-clay Works Co. sell 

 at Coal Island glazed sewerage pipes from 2" to 24" in bore, at 

 from 7\d. to 14s. per yard; plain or butt joint-pipes, 20 per cent, 

 less; compressed flooring-tiles, octagon and square, according to 

 sizes, from 12s. 6d. to 25s. per 100 ; black or red centres, from 5s. 

 to 7s. 6d. ; chimney-cans, according to size and finish, from Is. 6d. 

 to 7s. 6d. ; sewer-bottoms, from 7" x 14" to 23" x 24" at from 

 3s. 3d. to 6s. 6d. per lineal yard ; flue-covers, from 15" x 9" x 2" 

 to 24" x 24" x 3", at from 6±d. to 3s. 6d. each ; blast coke and 

 puddling furnace-blocks, cattle and glasshouse-blocks, D-shaped 

 round and oval gas-retorts ; unpressed fire-bricks, 55s. to 60s. per 

 1000 ; pressed, 65s. to 70s. per 1000 ; white-faced, 80s. per 

 1000 ; chamfered paving-bricks, 65s. to 70s. per 1000 ; vent- 

 linings ; oncomes ; wall-, cope-, and ridge-tiles, horse-mangers 



