[GreenKeys] [Bulk] Re: [Bulk] Re: Telephoto machines?

[Alf Fisher]

I know that Teledeltos paper rolls were also used in shipboard echo sounders 
back in the 40s & 50s.
These machines had a motor driven stylus that traced a black line wavy line 
to show the depth of the sea bed.
So there is another application.

73,
Alf
G3WSD


> The teledeltos paper is an interesting thing.  Some 20 years ago, I was
> employed by Motorola, and spent some time up in Oregon with Dr. Gertrude
> Rempfer, who was an expert in electron optics (She was one of very few 
> women
> who worked on the Manhattan project).
> She used teledeltos paper In conjunction with tee pins , which would then
> have a potential applied.  By probing the paper (which has a very uniform
> resistivity) with a voltmeter, one could see the field gradient, and have 
> a
> fair analog model of what the electron optics would do.  This was a
> technique I used for years to ray trace when designing an electrostatic
> electron optic, I had no idea the paper had another primary purpose!
>


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