9 Mar
2007
9 Mar
'07
10:10 p.m.
On 9 Mar 2007 at 23:18, Randy Dawson wrote:
Hows that for old as dirt?
I wasn't being facetious; one thing that struck me when I read the
Helmholtz work was his drawings of waveforms and even spectra of
sound waves. Very accurate; but how did he get them in 1863?
Some of the equipment was darned clever.
http://physics.kenyon.edu/EarlyApparatus/Rudolf_Koenig_Apparatus/Vibra
tion_Microscope/Vibration_Microscope.html
Lissajous figures date from about 1815:
http://physics.kenyon.edu/EarlyApparatus/Oscillations_and_Waves/Lissaj
ous_Figures/Lissajous_Figures.html
Cheers,
Chuck