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Posted by Joe on April 18, 2008, 3:25 pm
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On Fri, 18 Apr 2008 18:11:17 GMT, "Leo Lichtman"
>
>"Winston" wrote: If one were to hang a counterweight on the loop shown to
>the right,
>> would that act as a multiplier? (clip)
>^^^^^^^^^^^^^^^^^^^^
>Physics 1A: No. A counter weight shifts the zero--it does not change the
>ratios.
>
Right, my large Fairbanks platform scale (as well as all others of
that type I've seen) does exactly that. There are a number of flat,
circular plates that are stacked on a hanging plate that is suspended
from the right side. As you say, the zero is shifted, so the scale
that read from 0 - 200 lbs now reads from (say) 300 - 500 lbs. I
assume that is the purpose of the loop on my scale in question, as
well.
Joe
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Posted by Winston on April 18, 2008, 3:54 pm
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Leo Lichtman wrote:
> "Winston" wrote: If one were to hang a counterweight on the loop shown to
> the right,
>
>>would that act as a multiplier? (clip)
>
> ^^^^^^^^^^^^^^^^^^^^
> Physics 1A: No. A counter weight shifts the zero--it does not change the
> ratios.
Ah, I see. Thanks
--Winston
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Posted by Joe on April 18, 2008, 3:31 pm
Please log in for more thread options On Fri, 18 Apr 2008 08:02:58 -0500, "Paul K. Dickman"
>
>> OK, I posted a photo in the Dropbox: Hay_CottonScale.gif &
>> Hay_CottonScale.txt
>> Coming from this area, it's possible that it's a cotton scale, but I still
>> don't
>> know what would have been attached to the left side to bring it level. The
>> scale
>> is 0 - 50 lbs. Maybe a pan - it took about 2.75 lbs to level it out.
>>
>> See my note about the extra weights; It looks like I missed a good deal,
>> unless
>> I can find the dealer again.
>>
>> Sorry about the file size - IrfanView converted it to a smaller format,
>> but
>> defaulted to a .gif & I sent it before I realized it was no longer a .jpg.
>>
>> Joe
>
>50 lbs is way too light to be for cotton or hay.
>From the picture, it looks like the scale the old hardware store used to
>weigh nails in. Except it is missing the scoop shaped pan.
>
>Paul K. Dickman
>
I was under the impression that a lot of cotton scales were used in
the field to weigh the bags (not bales) as the individual brought them
in. Of course, I don't know how much any one bag would weigh when
full.
One interesting thing about the scale is that the beam is tapered. If
you loosen the counterweight setscrew just a little, it will slide to
the right, but not to the left. There must be a specific reason for
this, but I don't know what it is.
Joe
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Posted by Paul K. Dickman on April 18, 2008, 5:15 pm
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> On Fri, 18 Apr 2008 08:02:58 -0500, "Paul K. Dickman"
>
>>
>
>>> OK, I posted a photo in the Dropbox: Hay_CottonScale.gif &
>>> Hay_CottonScale.txt
>>> Coming from this area, it's possible that it's a cotton scale, but I
>>> still
>>> don't
>>> know what would have been attached to the left side to bring it level.
>>> The
>>> scale
>>> is 0 - 50 lbs. Maybe a pan - it took about 2.75 lbs to level it out.
>>>
>>> See my note about the extra weights; It looks like I missed a good deal,
>>> unless
>>> I can find the dealer again.
>>>
>>> Sorry about the file size - IrfanView converted it to a smaller format,
>>> but
>>> defaulted to a .gif & I sent it before I realized it was no longer a
>>> .jpg.
>>>
>>> Joe
>>
>>50 lbs is way too light to be for cotton or hay.
>>From the picture, it looks like the scale the old hardware store used to
>>weigh nails in. Except it is missing the scoop shaped pan.
>>
>>Paul K. Dickman
>>
> I was under the impression that a lot of cotton scales were used in
> the field to weigh the bags (not bales) as the individual brought them
> in. Of course, I don't know how much any one bag would weigh when
> full.
>
> One interesting thing about the scale is that the beam is tapered. If
> you loosen the counterweight setscrew just a little, it will slide to
> the right, but not to the left. There must be a specific reason for
> this, but I don't know what it is.
>
> Joe
No, the bags are enormous,usually well over a hundred lbs.
The cotton scales I've seen are all rustic looking things and weigh upwards
to 200lbs.
Here's a picture of one:
http://cgi.ebay.com/Antique-Hand-Cotton-scale-made-by-Sargent-N-Haven-CT_W0QQitemZ350049639707QQihZ022QQcategoryZ4115QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I think if you showed up at the end of the day with a 50lb sack of cotton,
you'ld be lookin for another line of work.
Paul K. Dickman
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Posted by Leon Fisk on April 19, 2008, 3:26 pm
Please log in for more thread options On Thu, 17 Apr 2008 22:22:22 -0400, Joe
>OK, I posted a photo in the Dropbox: Hay_CottonScale.gif & Hay_CottonScale.txt
>Coming from this area, it's possible that it's a cotton scale, but I still don't
>know what would have been attached to the left side to bring it level. The scale
>is 0 - 50 lbs. Maybe a pan - it took about 2.75 lbs to level it out.
Hi Joe,
I suspect you only have the beam portion of a platform
scale. Take a look at Fig 1 in this old patent diagram:
http://www.google.com/patents?vid=1072020
It looks like your beam may have been meant to sit in some
sort of framework. That would explain why it doesn't have
any hooks to hang it up with or hang stuff to be weighed on.
The McFarlane patent diagrams also use the same shape of
cut-out on the sliding weight. I couldn't find out much
about McFarlane Manufacturing other than they did make some
platform scales that used a dial indicator...
It seems like I have seen some floor type platform scales
that used a similar balance beam system before. Maybe this
will stir up some other peoples memories of what they looked
like.
--
Leon Fisk
Grand Rapids MI/Zone 5b
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>"Winston" wrote: If one were to hang a counterweight on the loop shown to
>the right,