. 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. gs. Sculptors use fine white marble. Some kinds of marble are gray, blue, black, or red. A Lesson on Coal. In the work of this lesson, specimens of the different kinds ofcoal were brought into the class-room by the pupils. A generaltalk between teacher and pupils developed the appearance, uses,kinds, modes of obtaining, and other facts concerning the sub-stance. A few experiments were performed to show how ga
. 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. gs. Sculptors use fine white marble. Some kinds of marble are gray, blue, black, or red. A Lesson on Coal. In the work of this lesson, specimens of the different kinds ofcoal were brought into the class-room by the pupils. A generaltalk between teacher and pupils developed the appearance, uses,kinds, modes of obtaining, and other facts concerning the sub-stance. A few experiments were performed to show how gasand coke are derived from coal. A common clay pipe was filledwith soft coal, and then the top of the bowl was covered withclay to prevent the escape of the gas. This was then heated,and when the gas began to escape through the stem, a lightedmatch was applied. The alcohol lamp was used to furnish theheat necessary. After the gas was burned, the bowl of the pipewas broken, and the coke taken out. Nature Study. 51 Some facts to be brought out in the lesson are: 1. Pennsylvania is the Great Coal State. 2. Two principal kinds of coal are anthracite (Fig. 22), andbituminous (Fig. 23).. Fig. 22.—Anthracite Coal. Alice Wilson, 10 yrs. 3. Anthracite coal is found in eastern Pennsylvania and inRhode Island. 4. It is much harder than bituminous coal. 5. Sulphur is often found in bituminous coal, and causes theyellow streaks in some coal.
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