Field Plots

[Phil]

September 1977; Durham University, England; first Applied Physics lab as an undergraduate. My lab partner and I were given bench space, a power supply, a voltmeter (analogue, but FET front-end), some silver dag, a paintbrush, and several eighteen-inch-square sheets of teledeltos paper. Instructions: spend the next three hours painting a variety of 2D electrode patterns on the paper, then map out the equipotential contours. Was it a good practical? Heck, I can still remember the details nearly 34 years later, so it must have created an impression as least as great as my wedding day.

They don't make practicals like that any more.

Phil M1GWZ



On 6 Jul 2011, at 15:28, fgentges at mindspring.com wrote:

> I had a problem getting Karl's url to work since the email software clipped it.  I finally got it and made a tiny url.  Go to
> 
> http://tinyurl.com/3vd52bg
> 
> This is one of Bob Pease's famous articles on one of so many fun subjects.
> 
> If anyone wants some sheets of teledeltos paper, I have a big stack of 11x17 sheets.  Let me know and I can bring it to tacos.
> 
> I used a bunch of it on my Kay sonographs which is a great audio spectrum analyzer. (Also longer ago that I like to remember.) The original purpose of the paper was to use a stylus with several hundred volts of signal to burn the image pixel by pixel as the paper is moved underneath the stylus on a rotating drum.  On the rotating drum is a plated recording surface where you record the signal and then play it back during analysis.  It was a marvelous machine from "before computers".
> 
> Frank K0BRA
> 
> 
> On 7/5/2011 11:27 PM, Karl W4KRL wrote:
>> Phil,
>> 
>> You are close to the source:
>> http://electronicdesign.com/article/analog-and-mixed-signal/what-s-all-this-
>> teledeltos-stuff-anyway-12594.aspx
>> 
>> I had a summer job at the Westinghouse R&  D Center in Pittsburgh longer ago
>> than I like to remember designing a variable reluctance motor. I used
>> teledeltos paper and a VTVM connected to a straight pin to map out the field
>> lines at various positions of the motor.
>> 
>> Karl W4KRL
>> 
>> -----Original Message-----
>> From: Phil [mailto:philmt59 at aol.com]
>> Sent: Tuesday, July 05, 2011 6:47 PM
>> To: Brian Hawes
>> Cc: Tacos
>> Subject: Re: Field Plots
>> 
>> Whatever happened to Teledeltos paper?
>> 
>> Phil M1GWZ
> _______________________________________________
> Tacos mailing list
> Tacos at amrad.org
> https://amrad.org/mailman/listinfo/tacos