ence is that the lava and stones over the surrounding country. The conditions are so arranged that when the wedge moves rollers move outward, carrying with them the wedge, and, until the angles become equal, the motion con- 9,100 feet near the center of the island, resumed its together, then the… … one of awful grandeur. The land for an extent of 120 The conditions may be obtained by the arrangement When the angles become equal, the conditions of repose miles in length by 20 in breadth was one mass of flame shown in the cut. Two pieces of wood are hinged to- are reached. gether, co as to open…
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