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By Silvanus P. Thompson

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19). did not come into contact the charge remained on the A Fig. 19. inner sphere but if the outer shell touched the inner sphere for but an instant, the whole of the electricity passed to the exterior and when the hemispheres were ; ; separated and removed the inner globe was found to be completely discharged. 31. Further explanation. Doubtless the explanation of this behaviour of electricity is to be found in the property previously noticed as possessed by either kind of electricity, namely, that of repelling itself hence it retreats as far as can be from the centre and remains ; ELEMENTARY LESSONS ON 34 [CHAP.

On letting the ball touch the inside the gold leaves still remain diverging now and if the ball is pulled out it is found as before, to have lost all its electricity. The fact that the gold leaves diverge no wider after the ball touched than did just they that proves when the charged ball is inside the right hollow conductor the induced charges are each of them precisely before, equal its own in amount to charge, and the interior negative charge exactly neutralises the charge on the ball at the moment when they touch, leaving the equal unexterior charge Fig.

Thus, Terquem showed that a pair of gold leaves hung inside a wire cage could not be made to diverge when the cage was electrified. Faraday constructed a conical bag of linenproofs, so are far, directed to Fig. 20. upon an insulating were attached, by which could be turned inside out. It was charged, and gauze, stand, it supported and to as which in Fig. 20, silk strings the charge was shown by the proof -plane and electroOn turning it scope to be on the outside of the bag. inside out the electricity was once more found outside.

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