[GreenKeys] Telephoto machines?

[Richard Knoppow]

     Interesting.  I had associated the name with the analyzer used in 
the Bell Labs experiment  but found it does not appear in the book 
"Visible Speech" I cited.   Evidently my memory was not so far off the 
mark.

On 6/30/2015 5:44 PM, Lester Veenstra wrote:
> The SONOGRAPH was an off line audio spectrum analyzer
> It could analyze speech or  visually demodulate the bits (bauds) of a fm/fsk
> system
>
>
> Lester B Veenstra  MØYCM K1YCM W8YCM
> lester at veenstras.com
>
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> -----Original Message-----
> From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
> Richard Knoppow
> Sent: Tuesday, June 30, 2015 6:37 PM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] Telephoto machines?
>
>        The term Sonograph reminded me of another device not related but
> the name tickled my memory.   This was a sound spectrograph developed at
> Bell Laboratories sometime around the mid-1940s and used for the
> analysis of speech.   A book was published describing the method and
> discussing some of the results under the title _Visible Speech_  Potter,
> Kopp and Green   (1948) D. van Nostrand and Company.   I thought the
> machine might have used Teledeltos paper but it seems to have used
> photographic paper.   A machine for "reading" the graphs was also
> designed.  I remember seeing a film or program about this research on
> television when I was a kid.  Perhaps available at Archive org or You
> Tube, I have not yet looked. Although pretty far removed from Teletype
> machines or even FAX machines I think it may be of some interest to
> those on this list. Note that Mellville Bell, Alexander Bell's father,
> devised a phonetic alphabet also called Visible Speech, many years
> before this spectrum analyzer.   Unfortunately the book does not seem to
> be available as a PDF on the web.   I believe several related papers
> were published in the BSTJ and in the Journal of the Acoustical Society
> of America but do not have specific citations.
>
> On 6/30/2015 10:10 AM, Lester Veenstra wrote:
>> And also use in the SONOGRAPH, a device well known to CTTs and CTMs.
>>
>>
>> Lester B Veenstra  MØYCM K1YCM W8YCM
>> lester at veenstras.com
>>
>>> -- Chris Elmquist N?JCF
>>       No, it was called Teledeltos paper.   It's a simple resistive
>> coating (carbon plus copper thiocyanate in the final version)
>> which is burned off by power from the writing stylus.  It's
>> not electrostatic; that puts something onto the paper. This takes it
>> off.
>>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL