Here is the response to my my questions about the use of the 
watt meter on GUI-Talk.  It sounds to me as though a 
voltage-controlled oscillator would do the job, such as the 
instrument that was available from Science for the Blind to tune 
up transmitters.  Does anybody know if anyone makes something 
like this any more or would it have to be custom built?  The 
cooperation of the manufacturer would probably need to be 
involved, to be sure that no other specifications were affected.  
==================BEGIN FORWARDED MESSAGE==================
>From: "Olga L. Espinola" <polycom@earthlink.net>
>Date: Sat, 24 Feb 2001 12:51:26 -0800
>Subject: Re: Watt meter
>To: gui-talk@NFBnet.org (Multiple recipients of NFBnet GUI-TALK 
Mailing List)
It's a meter that jumps around as the ultrasound machine is in 
use on a
patient. A light probe is out of the question because it would 
require
hands-on interaction. This needs to be something that can simply 
emit a tone
or rising or lowering pitch as the meter changes. Exact info is 
not needed.
-- This mailing list is sponsored by the National Federation of the Blind, NFB. To view or search an archive of messages for this list, go to: http://www.nfbnet.org For more information about the NFB, please call (410) 659-9314, point your internet browser to http://www.nfb.org or Telnet to nfbnet.org.===================END FORWARDED MESSAGE===================
This archive was generated by hypermail 2b29 : Sun Dec 02 2012 - 01:30:04 PST