Scophony(R) system questions

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Scophony(R) system questions

Postby Franck Kato » Tue Nov 07, 2017 2:26 pm

[moderator...] I'm posting this on behalf of Franck Katco - who I see has also just joined the forum. Welcome, Franck...

To Whom it May Concern:

I found Mr. Yanczer's web site last night and further research determined he deceased 3-16//14.

As the site is being maintained, is there someone to whom I could address my question as to how the Scophony® apparatus achieves either 240 or 441 line mode with a vertical polygon of 12 planes and a horizontal polygon of 20 planes.

Mr. Yanczer states that for the UK 405 line transmission standard , the motor would be at 30,375 rpm; 30,375 rotations/60 seconds= 506.25 rotations per second(for the drive motor).

The data does not state the polygon turn rate for either the vertical or horizontal planes, but I am assuming the motor rpm has loss conversions in the polygon rotation transfer and that the actual rate is in the neighborhood of the declared nominal target standard of 405 UK and 441 US.

Is the vertical frame rate so timed that the horizontal scan area actually yields the 405 line count.

Without the vertical movement, a static frame would logically only receive the vertical polygon 12 frame raster.

What is the distance/time formula to describe the line count output?

Please elucidate.

Thank you.

Franck Kato


The Scophony® data by the Wikipedia path has a 23 page 1938 booklet referencing split optics and data storage in the sonic Jeffree Cell.

What is the device doing to provide the horizontal line count and the stated vertical frame rate.

The description of the Jeffree Cell apparently is amplitude modulation of the optic wave fronts to derive a 200 fold increase in light output, thus permitting acceptable theatre pictorial quality.


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image2.png


Mr. Yanczer's 1987 volume, THE MECHANICS OF TELEVISION refers only to the Nipkow disc method rather than the Scophony® system which derives from Czarist Russia's Boris Rosing 1907 per Wikipedia link.
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Re: Scophony(R) system questions

Postby Harry Dalek » Tue Nov 07, 2017 8:13 pm

To get these line rates i know Georg from Germany made 2 mechanical monitors for 625 line one using 2 mirror drums other a mirror drum and vibrating mirror skipping every 2nd line because of the back and forth movement of the mirror ...he can be found here .
https://www.facebook.com/georg.zimmermann.75
Other reading for this era and Scophony here in these magazines 35 to 1936 issues i think ,i recall a bit of Scophony system in the issues
http://www.americanradiohistory.com/Tel ... r_Page.htm
heres a great build up to 60 line from this forum
viewtopic.php?f=1&t=2090
And my octagon mirror laser monitor
viewtopic.php?f=1&t=1557&hilit=octagon
http://www.mightbemoving.de/LASER-Point ... g-Mirrors/
The main problem using 2 mirror drum idea is if you make your own mirror drum there can be no mistake each mirror in the drum has to lay true no difference to the mirror before it other wise the tv image will shake wobble ..using a premade mirror fixes this problem for the line mirror but you still have to make the framing mirror drum unless you can buy one as well ....can be 4 mirrors up a square drum .
This 2 drum system is a multi system monitor only limited to line drum speed .
I would start small low line rates and work my way up if you are thinking of a Scophony !
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Re: Scophony(R) system questions

Postby OmegaProductions » Wed Nov 08, 2017 5:10 am

WOW Harry! :D This is very exciting seeing a recreation of the Scophony TV system. They are not that much popular on the internet, very less known mechanical TV format. And is probably the advanced mechanical TV system I've seen. The machines were sadly lost and only the motor survives.

But now...there's finally a recreation of the lost format! I'm so excited! Very impressive work! Cheers Harry! :D :) :wink:
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Re: Scophony(R) system questions

Postby Harry Dalek » Wed Nov 08, 2017 5:15 pm

OmegaProductions wrote:WOW Harry! :D This is very exciting seeing a recreation of the Scophony TV system. They are not that much popular on the internet, very less known mechanical TV format. And is probably the advanced mechanical TV system I've seen. The machines were sadly lost and only the motor survives.

But now...there's finally a recreation of the lost format! I'm so excited! Very impressive work! Cheers Harry! :D :) :wink:



Well its sort of like one the Scophony system but if you look at how the original worked there are differences ,Still the 2 drum mirror drum system and modulated laser is more than likely as close as any one will get to copying that monitor idea these days .
It has one thing over the original it worked at a higher line rate so out did it ,Georg told me both he's monitors still exist boxed away for safe keeping :wink:
https://shop.heise.de/katalog/laser-tv-projektor
Hes pdf can be down loaded here,,,,,, i have it on file but can't find it as its not easy to work out to down load .....being younger than me you should work it out in a flash...
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Re: Scophony(R) system questions

Postby OmegaProductions » Thu Nov 09, 2017 3:41 am

Hhummm...interesting! :?

Some Scophony sets back in the day look quite huge for the consumers to buy and bring in their living rooms! :shock:
Scophony TV set.jpg

However, I find it fascinating, but too complex for me! :oops:
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Re: Scophony(R) system questions

Postby Panrock » Thu Nov 09, 2017 7:54 am

That's something of rare beauty... and I'm not just referring to the lady on the right! :lol:

Steve O
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Re: Scophony(R) system questions

Postby Harry Dalek » Thu Nov 09, 2017 8:12 pm

That model is the the ekco 1938 looks to have been 6 models from 36 to 39
Its interesting the vibrating mirror and stationary lens strip in a stair case see PDF i think this is a camera version of it
http://www.earlytelevision.org/scophony.html
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Scophony(R) system questions

Postby OmegaProductions » Fri Nov 10, 2017 3:38 am

Oh yeah... Ekco is one of those radio companies that make very fragile Bakelite radio sets! :?

But anyway...I realise how that Scophony mirror drum with line scanning works. Here's a picture:

Screenshot 1.png
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