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INTRODUCTION.
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The construction of such a magnet, could it be effected, followed, as it would be, by the construction of many more, would certainly afford a solution of the burning question set before us by Sir John Gorst, "how to back the tide of migration of the people into the towns, and to get them back upon the land."
A fuller description of such a magnet and its mode of construction will form the theme of subsequent chapters.
