User:John R. Brews/Miscellaneous

(PD) Image: John R. Brews Frequencies of various pure tones. The various A-notes are a factor of two apart in frequency.

(PD) Image: John R. Brews Timeline for key scientists in classical mechanics     (CC) Image: John R. Brews & Aleksander Stos Data generated by Aleksander Stos. Thirty-day moving average of edit activity on CZ     (PD) Image: John R. Brews Number of articles on English Wikipedia vs. year. (Data from Wikipedia)     (PD) Image: John R. Brews Number of applicants for administrator privileges on English Wikipedia by year. (Data from Wikipedia.     (PD) Image: John R. Brews Number of new accounts per month on WP over its lifetime. (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     (PD) Image: John R. Brews Number of English WP contributors making 100+ edits/month by year. Average drop is 93/year. Data from Wikimedia.     © Image: John R. Brews Top and bottom envelope functions for a modulated sine wave.     (PD) Image: John R. Brews First six terms of Fourier series for sawtooth.     (PD) Image: John R. Brews Musical clefs arranged on a stave.     (PD) Image: John R. Brews Envelope of a musical tone     (PD) Image: John R. Brews Approximate spectrum of four instruments playing A4: 440 Hz