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The third tube was in water pickled with chlorine to keep it from  
turning green.
Clifford
On Aug 18, 2008, at 9:43 PM, David Smith wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
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> *******
>
> Was the real sediment also in mineral oil or was it in water?
>
> Dave Smith
> Da Vinci Science Center
>
> On Mon, Aug 18, 2008 at 8:21 PM, Clifford Wagner
> <[log in to unmask]>wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology  
>> Centers
>> Incorporated, a worldwide network of science museums and related
>> institutions.
>>
>> ********************************************************************* 
>> ********
>>
>> I protoyped and made this device in 1983 at the Franklin  
>> Institiute for our
>> Changing Earth Exhibit.  Hadn't seen it before then, but maybe it  
>> did exist
>> before that.    There were three 3inch diameter plexiglass tubes   
>> about 18
>> inches long, each on it's own vertically oriented turntable.    
>> They had 1/4
>> thick walls.
>> Their ends were capped with plexiglass and Orings with threaded  
>> brass rods
>> running the length of the tube holding the ends on.  Here's why to  
>> do three
>> tubes on three turntables:  The first has as a label "Same size,  
>> different
>> density"  and has about 30 steel and 30 nylon balls @ 3/8  
>> diameter.  They
>> are in Mineral oil bought at the drug store.  Turn the tube over  
>> and the
>> steel balls fall much faster through the liquid.  The second tube  
>> has "Same
>> density, Different size"  and has steel ball bearings 3//8, 3/16  
>> and 1/16 of
>> an inch diameter balls, also in mineral oil.  The small balls take  
>> quite
>> some to get down to the bottom of the overturned tube.   The  
>> reason is that
>> the surface area of a solid sphere goes up by the square, while  
>> it's volume
>> and therefore mass goes up by the cube.  The third tube has real  
>> stones and
>> sediment in it.   Experiment with what you use here; it was nice  
>> having some
>> really fine sediment that would leave a layer on top if it was  
>> allowed to
>> sit for ten minutes.   Big particles  lined the bottom, and by  
>> picking
>> materials of different densities that had different colors, you  
>> could get
>> some nice layering.
>>
>> The overall text explained how the size and density of material in  
>> a stream
>> decides how far downstream it gets carried.  Boulders don't go  
>> very far.
>>  The finest silt can stay in suspension to make it all the way to  
>> the sea.
>>
>> We did add a leather pad in the back to keep it from being spun at  
>> high
>> speed.
>>
>> I might be able to dig up a photo if it would help.
>>
>> Clifford Wagner
>>
>> On Aug 18, 2008, at 6:04 PM, Mike Levad wrote:
>>
>>  ISEN-ASTC-L is a service of the Association of Science-Technology  
>> Centers
>>> Incorporated, a worldwide network of science museums and related
>>> institutions.
>>>
>>> ******************************************************************** 
>>> *********
>>>
>>> Hey Everybody,
>>>
>>> We are building a sediment model which consists of a tube with a  
>>> clear
>>> fluid
>>> in it and different sized particles. When you turn it over the  
>>> bigger
>>> stuff
>>> hits the bottom first and the little stuff stays on top.  I have  
>>> seen this
>>> in a few different places.  Is anybody willing to share what  
>>> works best
>>> for
>>> the clear fluid and the sediment particles?
>>>
>>> Thanks,
>>>
>>> Mike
>>>
>>>
>>>
>>>
>>> Mike Levad
>>> Lead Exhibit Developer
>>> 651-789-4735 (direct)
>>> 651-631-2211 xt.735
>>> 651-631-0707fax
>>> Toll free: 800-433-9599
>>> [log in to unmask]
>>> www.splitrockstudios.com
>>>
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>
>
>
> -- 
> David L. Smith
> Da Vinci Science Center
> Allentown, PA
> http://www.davinci-center.org
>
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> For information about the Association of Science-Technology Centers  
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