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<blockquote data-quote="Des Miles" data-source="post: 784502" data-attributes="member: 14311"><p>If you place an old alarm clock in there, remove the atmosphere, then you won't hear the alarm ringing (I think). Sound not traveling through a vacuum and all. Get a bell-jar to fit Jonny and try it! Remember to coat the rim of the jar with some form of grease ( petroleum jelly) so it seals air tight on the base plate. You can show kids so much basic physics with this at home. <img src="https://www.avforums.co.za/Smileys/default/dunno.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Des Miles, post: 784502, member: 14311"] If you place an old alarm clock in there, remove the atmosphere, then you won't hear the alarm ringing (I think). Sound not traveling through a vacuum and all. Get a bell-jar to fit Jonny and try it! Remember to coat the rim of the jar with some form of grease ( petroleum jelly) so it seals air tight on the base plate. You can show kids so much basic physics with this at home. [IMG]https://www.avforums.co.za/Smileys/default/dunno.gif[/IMG] [/QUOTE]
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