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Tubes In Oil
Tubes In Oil
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Old 24th December 2018, 08:32 PM   #1
PRR is offline PRR  United States
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Default Tubes In Oil

Electronics magazine 1947-1948.

Multi-color rotogravure printing. Once known for printing the Sunday color comics, but also widely used for fine work on a variety of materials; this one prints on metal foil. You have to dynamically jiggle the gearing to make all the colors align even as the base web slips shrinks and snakes.

AND: the inks used for rotogravure must dry quickly (between one roller and the next), so are usually highly volatile. Explosive. Comics-printing presses used to blow-up a lot. Strict regulations came into effect.

So this guy figured, if all the tubes were submerged in oil, that would meet the UL requirements. Oil-fill is routine in large transformers, also some underwater motors. It apparently works for tubes.

(Yes, I know the old ham trick of mounting a metal 6L6 in a can of oil so the ratings may be exceeded at least short-term. But I never saw a whole tube system in oil.)

https://www.americanradiohistory.com...cs-1947-11.pdf
https://www.americanradiohistory.com...cs-1948-03.pdf
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Last edited by PRR; 24th December 2018 at 10:08 PM. Reason: cant spell
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Old 24th December 2018, 09:52 PM   #2
billshurv is offline billshurv  United Kingdom
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Tubes In Oil
11 miles of print per hour in colour. That's pretty impressive for the time.


Roll forward 60 years and the rate of tree eating is now scary. The world’s biggest and fastest newspaper press apparantly the big mitsubishi presses can kick out 25 full colour newspapers a second.
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Old 24th December 2018, 10:06 PM   #3
Eli Duttman is offline Eli Duttman  United States
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FWIW, the K&E drafting tools add caught my eye. That's what I was taught, long ago. I know nada about CAD/CAM.

BTW, intaglio printing is still used for the production of currency (paper money).
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Old 24th December 2018, 10:21 PM   #4
PRR is offline PRR  United States
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> the K&E drafting tools ad caught my eye.

Yes; those CAD guys forget we drew plans for mighty fleets, fast tanks, and skyscrapers with batteryless tools that fit in a coat pocket.

More nostalgia:
ELECTRONICS: Electronics Engineering magazine beginning in 1930
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Old 25th December 2018, 09:08 AM   #5
Wavebourn is offline Wavebourn  United States
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Tubes In Oil
Before drafting by ink we had to learn to draft by pencils. They had to be clean, and lines had to be of different, appropriate thickness!

I hated that. We had 2 separate disciplines, "Engineering Graphics" and "Drafting Geometry".
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Old 25th December 2018, 10:10 AM   #6
Chris Hornbeck is offline Chris Hornbeck  United States
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Old timey Hams would stick 6L6's or 1625's transmitter finals upside down in a bucket of used motor oil.
Maybe so you couldn't see the plate color.


Ho, ho, yo,
Chris
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Old 25th December 2018, 12:31 PM   #7
anti is offline anti  Slovakia
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Rotring was cool. They also had alcohol-based ink refills that were perfect for one-off diy pcbs when used together with letraset-based pads and ic dip patterns.
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Old 25th December 2018, 12:38 PM   #8
Pano is offline Pano  United States
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That tube in oil rig has to make for some messy maintenance.
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Old 25th December 2018, 12:58 PM   #9
ethermion is offline ethermion  Antarctica
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Quote:
Originally Posted by billshurv View Post
11 miles of print per hour in colour. That's pretty impressive for the time.


Roll forward 60 years and the rate of tree eating is now scary. The world’s biggest and fastest newspaper press apparantly the big mitsubishi presses can kick out 25 full colour newspapers a second.
The Washington post had two of them near me. Now, they are offline. Dunno if they got sold. Tree eaters indeed, but I am not sure I know anyone who gets a printed paper anymore.

Tubes in oil makes me think pcb.
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Old 25th December 2018, 02:54 PM   #10
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by Wavebourn View Post
Before drafting by ink we had to learn to draft by pencils. They had to be clean, and lines had to be of different, appropriate thickness!

I hated that. We had 2 separate disciplines, "Engineering Graphics" and "Drafting Geometry".
Quote:
Rotring was cool.
We too.
I was real happy when we reached the ink and pen level, later improved by Rotring pens , all of my pencil drawn plans were objected as being "grey", because of graphite smears.
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