The pictorial sketch-book of Pennsylvania : or, its scenery, internal improvements, resources, and agriculture, popularly described . FIG. 23. FIG. 24. Such contortions were shown by Sir James Hall, by a simple ex-periment, to have resulted from lateral pressure, attended with somedegree of resistance, both above and beneath. He took severalpieces of cloth—some cotton, some linen—and having placed themhorizontally on a table, c, fig. 25, covered them by a weight, a,placed also horizontally on the pieces of cloth. He then exposed.

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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources