. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . times from A tothe opposite end, always in the same direction. Thentake the south pole of your magnet and place it on the Bend of your needle (opposite from A). Be sure that youcarry the magnet from one extreme end of the needle tothe other at each stroke and always see to it that northpole of the magnet is contacted with t
. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . times from A tothe opposite end, always in the same direction. Thentake the south pole of your magnet and place it on the Bend of your needle (opposite from A). Be sure that youcarry the magnet from one extreme end of the needle tothe other at each stroke and always see to it that northpole of the magnet is contacted with the north pole of theneedle and vice versa. NORTH AND SOUTH POLES. Another way to make a magnet is to place the needleon the magnet, the desired north pole of the needle co-inciding with the north pole of the magnet and vice hammer on the needle or bar repeatedly with awooden mallet. The same result may be obtained byselecting a bar just long enough to bridge across to bothpoles of an electromagnet. The bar is tapped as was thecase before. If a magnetized knitting needle be broken at its middlepoint each half of the needle is found to be a ends which were north and south poles before break-ing remain north and south, while the broken ends become. 3^ ) o 31 5 s Pi o £ o r £§ O o£ N 0) O c£ v ■ si d t_ S m rt N O
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Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
