. 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. molders clay, and dampen it until it will packwhen pressed in the hand. Sand or common red clay will dovery well in place of the other, but molders clay is cleaner. Pul-verize an ounce of chlorate of potash, and then mix it thoroughlywith half an ounce of dry white sugar. Procure a small quantityof sulphuric acid (H^SO^). Now build up a small pile of the clay, and scoop out from thecentre a part, as in this f
. 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. molders clay, and dampen it until it will packwhen pressed in the hand. Sand or common red clay will dovery well in place of the other, but molders clay is cleaner. Pul-verize an ounce of chlorate of potash, and then mix it thoroughlywith half an ounce of dry white sugar. Procure a small quantityof sulphuric acid (H^SO^). Now build up a small pile of the clay, and scoop out from thecentre a part, as in this figure. (Fig. 15.) Put a piece of paper, about four inches in diameter, in thebottom of this hole ; then put in the mixed potash and sugar. Take a pencil or pen-holder (Fig. 16), and run it through acircle of paper about as large as the first one ; press it down uponthe mixture. Pack the clay carefully down upon the paper andabout the pencil, turning the pencil around now and then inorder that it may be removed at last. The volcano will now be complete (Fig. 17), with the mixture Intermediate Molding in Sand. 37 three or four inches from the top, and a clear hole leading downto To light the volcano, take a long straw or a piece of glass tub-ing and drop a small quantity of the sulphuric acid down the hole. ?I^^^&M^,.
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Keywords: ., bookcentury1800, bookdecade1890, bookidmapmodelingi, bookyear1894
