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#629025 - 03/09/07 11:10 AM Tuning partials
Steven G Offline
Junior Member

Registered: 02/14/07
Posts: 5
Loc: Fountain Hills, AZ
I'm new to this forum and have recently started taking Randy Potter's course. One of the reading assignments is in Reblitz's second edition on page 214 and deals with partials. Initially, Reglitz says that all fifths are narrow, and all major thirds, fourths and sixths are wide. On page 215, this is restated saying that Fourths and Fifths are narrow. so my question is: Are fourths narrow or wide? Can anyone clarify?

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#629026 - 03/09/07 11:13 AM Re: Tuning partials
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 24464
Loc: Oakland
If (major) fifths are narrow, fourths have to be wide.
_________________________
Semipro Tech

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#629027 - 03/09/07 12:27 PM Re: Tuning partials
Cy Shuster, RPT Offline
3000 Post Club Member

Registered: 12/18/05
Posts: 3458
Loc: Albuquerque, NM
...because an octave is a fourth plus a fifth.

Fifths have to be narrow because of another complication Pythagoras discovered. An octave above A440 is A880, a ratio of 2:1, or 2^1 (two to the first power). Over the span of seven octaves, the highest note's frequency is 2^7 that of the lowest, or 128:1.

A fifth has frequencies in the ratio 3:2. Seven octaves contains 12 fifths. The ratio of the highest note to the lowest, calculated from fifths, is (3/2)^12, or 129.7 and change. This difference between 129.7 and 128 is the "Pythagorean comma".

So to make fifths fit into octaves over the span of a piano, they have to be narrow.

--Cy--
_________________________
Cy Shuster, RPT
www.shusterpiano.com
Albuquerque, New Mexico
Director, PTG Norfolk 2016 Technical Institute
http://convention.ptg.org

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#629028 - 03/09/07 06:36 PM Re: Tuning partials
Steven G Offline
Junior Member

Registered: 02/14/07
Posts: 5
Loc: Fountain Hills, AZ
Thanks for your replies. I understand now.

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#629029 - 03/09/07 09:08 PM Re: Tuning partials
Anne Francis Offline
500 Post Club Member

Registered: 02/03/06
Posts: 569
Loc: Toronto, ON
My book's in the car so I can't check it but I suspect there may be some confusion between "narrow" and "slow". Fourths and fifths both beat slow (while thirds and sixths are fast), but fourths are wide and fifths are narrow.
_________________________
Anne Francis
Piano Tuner-Technician

Check out my blog! www.annefrancis.ca/blog

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#629030 - 03/10/07 02:58 AM Re: Tuning partials
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 24464
Loc: Oakland
What is important to know is how to determine whether to raise or lower a note when it is close. If the note a fifth below the note is beating too fast and the note a fourth below it is beating too slow, the note is flat, and vice versa. Once you know all these things, you are well on the way to an exciting career as a key holder for a pipe organ tuner! Add hammer technique and you can tune pianos!
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Semipro Tech

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