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Fig. 1, and approach it with an electrified amber rod, we will see that the pith ball will first fly towards the rod, and that immediately it touches the rod it will be repelled. 5. This is because by contact with the rod the pith ball has itself become charged, and as long as both the pith ball and the amber rod retain their charges, repulsion will take place whenever they are brought near each other. 6. I f, now, instead of electrifying an amber rod with a piece of silk, we electrify a piece of sealing-wax by rubbing it with a piece of flannel or fur, and we approach the already electrified pith ball with the electrified sealing-wax, we find that instead of repelling the ball as the electrified amber rod does, it attracts it, although as soon as they come in contact with each other the pith ball is again repelled, and after being repelled by the electrified sealing-wax will once more be attracted by the electrified amber. 7. When this simple experiment is analysed, it is found that there are two kinds of electrification one produced by rubbing amber with silk, and the other produced by rubbing sealing-wax with fur. 8. In order to distinguish between the two, that produced by rubbing amber with silk is called a positive charge (+), and that produced by rubbing sealing-wax by fur is called a negative charge (- ). 9.
(Typographical errors above are due to OCR software and don't occur in the book.)
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Présentation de l'éditeur
This book an EXACT reproduction of the original book published before 1923. This IS NOT an OCR?d book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.
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