Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 795
kinds ofmanufacturing plants. Most of us are familiar with the antics per-formed by iron filings, needles, or small particlesof metal when a magnet is pushed within theirfield; and the construction of small toys that canbe moved about by a small horseshoe-magnet has 558 NATURE AND SCIENCE FOR YOUNG… … SEVEN KEGS FILLED WITH NAILS LIFTEDBY AN ELECTRO-MAGNET. A visit to any of our large steel-mills or foun-dries equipped with electro-magnets would stillfurther impress us with the wizardy of this won-derful device, for there we would see invisiblefingers picking up mammoth girders, lifting hotsteel…
Children's literature
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