User:John R. Brews/Miscellaneous: Difference between revisions

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|Note frequencies.png|Frequencies of various pure tones. The various ''A''-notes are a factor of two apart in frequency. Based on data from {{cite book |title=The Physics of Music and Color |author=Leon Gunther |url=http://books.google.com/books?id=4Apd-toEDcYC&pg=PA357 |chapter=Figure 11.2: Piano keyboard |isbn=1461405564 |year=2011 |publisher=Springer}}
|Average CZ edits per day.PNG|[http://en.citizendium.org/wiki/File:Editsbyday30.png Data] generated by Aleksander Stos. Thirty-day moving average of edit activity on CZ
|Average CZ edits per day.PNG|[http://en.citizendium.org/wiki/File:Editsbyday30.png Data] generated by Aleksander Stos. Thirty-day moving average of edit activity on CZ
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Revision as of 11:10, 17 June 2012

Frequencies of various pure tones. The various A-notes are a factor of two apart in frequency. Based on data from Leon Gunther (2011). “Figure 11.2: Piano keyboard”, The Physics of Music and Color. Springer. ISBN 1461405564. 
(PD) Image: John R. Brews
Frequencies of various pure tones. The various A-notes are a factor of two apart in frequency. Based on data from Leon Gunther (2011). “Figure 11.2: Piano keyboard”, The Physics of Music and Color. Springer. ISBN 1461405564. 
Data generated by Aleksander Stos. Thirty-day moving average of edit activity on CZ
(CC) Image: John R. Brews & Aleksander Stos
Data generated by Aleksander Stos. Thirty-day moving average of edit activity on CZ
Timeline for key scientists in classical mechanics
(PD) Image: John R. Brews
Timeline for key scientists in classical mechanics
Number of articles on English Wikipedia vs. year. (Data from Wikipedia)
(PD) Image: John R. Brews
Number of articles on English Wikipedia vs. year. (Data from Wikipedia)
Number of new accounts per month on WP over its lifetime. (Data from Wikimedia.)
(PD) Image: John R. Brews
Number of new accounts per month on WP over its lifetime. (Data from Wikimedia.)
New articles per day on English Wikipedia. Average drop in production is 135/year. Data from Wikimedia
(PD) Image: John R. Brews
New articles per day on English Wikipedia. Average drop in production is 135/year. Data from Wikimedia
Number of English WP contributors making 100+ edits/month by year. Average drop is 93/year. Data from Wikimedia.
(PD) Image: John R. Brews
Number of English WP contributors making 100+ edits/month by year. Average drop is 93/year. Data from Wikimedia.
Top and bottom envelope functions for a modulated sine wave.
© Image: John R. Brews
Top and bottom envelope functions for a modulated sine wave.
First six terms of Fourier series for sawtooth.
(PD) Image: John R. Brews
First six terms of Fourier series for sawtooth.
Musical clefs arranged on a stave.
(PD) Image: John R. Brews
Musical clefs arranged on a stave.
Envelope of a musical tone
(PD) Image: John R. Brews
Envelope of a musical tone
Approximate spectrum of four instruments playing A4: 440 Hz
(PD) Image: John R. Brews
Approximate spectrum of four instruments playing A4: 440 Hz
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