[Jewelry making - Article 00213] - Re: [Orchid] Ultrasonic cleaner and damage to hands

[Paul D. Reilly]

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>      The question is, is it damaging for your hands to be ho=
lding
>     something that is immersed in the ultrasonic water without the
>     part you're holding being immersed? 


Tina,

    We have so many chemists in the group I'm surprised we don't seem to
    have any physicists speaking up about sound transmission or the
    damage potenial of ultrasound after traveling through a solid. 

    Some food for thought:-  While I can not say for certain what
    ultrasound will do to your body after traveling through the cleaner
    and your solid part; I can say for certain that sound travels
    through solids more effeciently than through air and thus ultrasound
    has the potential to be damaging after traveling through your casting
    tree even if the portion of it that you are grasping is not within
    the solution. As an example of the principle: auto mechanics will
    use a dowel or metal rod held to their ear to move about an engine to
    pin point the source location of an engine noise.Try it, it really
    works...just be careful to avoid any moving parts!  Perhaps if your
    casting tree were hung loosley from something else (a wire, tongs,
    etc.) the loose jointing would reduce transmission of the sound wave
    to your hand enough to avoid damage, if in fact damage can occur in
    that way.  I'm not a physicist or ultrasound engineer, I'm just
    remembering some long ago college physics leason.  

Paul D. Reilly 
The Paul Reilly Company 
4308 Driftwood Drive Colorado Springs, 
Colorado80918 
Phone: 719-598-9307 Fax: 719-592-0794
Email: pmreilly AT pcisys.net


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