. Map modeling in geography : including the use of sand, clay putty, paper pulp, plaster of Paris, and other materials : also chalk modeling in its adaptation to purposes of illustration. know another name for that? Petroleum. These all come from the coal, men say, and thereare many other coal-products. Coal-tar. Yes, and some verybeautiful dyes are made from petroleum. 176 Forms of Coal, Do you know what is made from the clay that is under thecoal? Mr. Hammond, my uncle, makes fire-brick from theclay. In Westmoreland county. At Bolivar. To linethe inside of stoves and furnaces. That protects
. Map modeling in geography : including the use of sand, clay putty, paper pulp, plaster of Paris, and other materials : also chalk modeling in its adaptation to purposes of illustration. know another name for that? Petroleum. These all come from the coal, men say, and thereare many other coal-products. Coal-tar. Yes, and some verybeautiful dyes are made from petroleum. 176 Forms of Coal, Do you know what is made from the clay that is under thecoal? Mr. Hammond, my uncle, makes fire-brick from theclay. In Westmoreland county. At Bolivar. To linethe inside of stoves and furnaces. That protects the iron. Willie says, I found some prints of leaves on a piece of coal.* Limbs and bark. These belong to plants. Did the coal comefrom plants? We think it did. How much it has beenchanged! Willie may bring the leaf-coal into class to-morrow. Ferns. These were much larger than those which grow inour swamps. How many in class have ever seen any other kind of coal ?None. Here is a piece of coal, found in the eastern part of ourstate. Compare it with that which is found here. It isharder. It does not break into layers. That is bright allover. There are two kinds of coal. (Bzmmznous.). (Anthracite,) THE GREAT HARD COAL STATE SOFT PENNSYLVANIA, Fig. 81.(first map of state.) Products of Coal. 177 A State,—Pennsylvania. A County,— County,—Butler. A Village,—Slippery Village,—Bolivar. The coal-products are : HARD COAL, ^^g j natural, SOFT COAL, ( manufactured. COKE, COAL-TAR, PETROLEUM, DYES. (From the underlying clay, Fire-brick.) (The writer includes in this lesson some things which are generally regarded as anything butelemental ; still to little children who may see these sights in our state, a row of flaming coke-ovens a mile long, or the volcanic outbursts of great steel works, are nothing unusual, Do YeNexte Thinge is inscribed upon the walls of the great school at Eton.) ,78 Coke Ovens.
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