Posted by Chuck(G) (more...) on June 17, 2002 at 14:53:17:
In Reply to: Re: Hi-Pitch / Lo-Pitch / A440 - When?? posted by followup question on June 17, 2002 at 12:19:55:
Below is a 1916 lecture advocating A=435.
Here's another link from the same text:
Waveform analyzer
to show how they did things before electronic computers.