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ATTN: Refractometer users to help with gold cup research
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kieranjol
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Posted Tue Feb 28, 2012, 11:20am
Subject: ATTN: Refractometer users to help with gold cup research
 

Click Here (theotherblackstuff.ie)

David Walsh has created a form which allows you to enter the data from your refractometer and evaluate your brews, allowing for a larger sample size for gold cup research. James Hoffmann had a post about this earlier as well. I plan on contributing anyhow. I'm expectng a post from Netphilosopher about oven drying coffee samples, not sure if they will be accepted or not!
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tjkoko
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Posted Tue Feb 28, 2012, 11:37am
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

Holy Scientifique!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Netphilosopher
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Posted Tue Feb 28, 2012, 3:16pm
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

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jpender
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Posted Fri Apr 12, 2013, 8:44am
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

Does anyone know where to find the data from the two phases of the David Walsh study?

David Walsh originally posted, "I would envisage this running for about 6 months, at which time the data would be published and freely available for anyone to use/analyse." (his emphasis). I know that a graph summarizing the information was in Vince Fedele's talk last year.

I'd be curious to see the data... if they're available.
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Netphilosopher
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Posted Fri Apr 12, 2013, 8:53am
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

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jpender
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Posted Tue Apr 16, 2013, 12:50pm
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

jpender Said:

Does anyone know where to find the data from the two phases of the David Walsh study?

Posted April 12, 2013 link

Funny! If I had thought to check back I'd have found that David Walsh posted the data less than four hours after I asked the question: Click Here (theotherblackstuff.ie)

A coincidence or is he listening?

It's a shame the brewing method wasn't part of the dataset. Somehow or another that information was included in the talk Vince Fedele gave.
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Netphilosopher
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Posted Wed Apr 17, 2013, 4:07am
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

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jpender
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jpender
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Posted Wed Apr 17, 2013, 8:13am
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

It's nice to have the numbers but they are unfortunately not particularly illuminating.

I was hoping to see the big peak at 19% extraction and the sub-peak at 16% that was illustrated in Vince's talk. Vince used an abbreviated summary of partial submissions from the phase II data. But when you plot all of the phase II data where preference is 7 or higher there is no sub-peak. Oh well.

I guess this coffee stuff is complicated.


edit: I take that back, there does appear to be something there. It's just hard to say without the brew method information.

jpender: pref7to9.jpg
(Click for larger image)
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Netphilosopher
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Posted Thu Apr 18, 2013, 2:29am
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

v
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jpender
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jpender
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Posted Thu Apr 18, 2013, 3:10pm
Subject: Re: ATTN: Refractometer users to help with gold cup research
 

Netphilosopher Said:

You had no $20 decent precision/repeatability electronic scale - your best bet was a balance scale.  You're dealing with milligrams on one hand (the dissolved solids) in concentrations less than 2% so you have to deal with kilograms...

Posted April 18, 2013 link

Did Lockhart really evaporate coffee by the kilogram?

Lavoisier had a balance that could measure to a milligram two centuries before Lockhart.
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