Date: Thu, 14 Nov 2002 16:37:49 -0500

Author: Tom Ford

Subject: RE: Demonstration Pictures


No, it is most likely a crude carbon microphone. It needs to be used with
an appropriate circuit so that vibrations, say from a ticking watch
(remember when?) on the base would cause the resistance through the device
to change enough to be reported to that outside circuit. A simple telephone
series circuit should do for checking this out.

Tom Ford

At 10:23 AM 11/14/02 -0600, you wrote:
>Your carbon electrode thingy sounds like the electrode assembly for an Arc
>Spectrograph. I don't suppose there is a Cenco number on the thing that I
>could cross reference??