. 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. 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^,.. Fig. 17. Do not look into the hole to see about the eruption. It will generallyoccur in a minute or less after the acid is poured in. If it does 38 Intermediate Molding in Sand. not go, put in more acid. A very little cold water, added to theacid just before it is used
. 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. 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^,.. Fig. 17. Do not look into the hole to see about the eruption. It will generallyoccur in a minute or less after the acid is poured in. If it does 38 Intermediate Molding in Sand. not go, put in more acid. A very little cold water, added to theacid just before it is used, will generally expedite matters. Trya little of the mixture in a shovel before you build a volcano, andthe acid can thus be adjusted. With the ordinary commercialsulphuric acid, however, no trouble should be the acid is too strong, and should be diluted by pour-ing some of the acid into a small quantity of water. Intermediate Molding in Sand, 39
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Keywords: ., bookcentury1800, bookdecade1890, bookidmapmodelingi, bookyear1894
