Strange CRT display graticule

[Grahame]

I recently bought a Mullard DP7/5 CRT and it came with this strange display graticule

It is a nice snug fit on the CRT so they look like they belong together. Anyone know what it was for or can offer guesses?

Grahame

[Dekatron42]

It comes from a TDMS, Telegraph Distortion Measuring Set  : http://www.albinarrate.com/index.php?option=com_content&view=article&catid=22:vintage&id=35:tdms There were different models all having the same graticule but somewhat differemt designs and used a few types of CRTs.

/Martin

[Grahame]

Hi Martin

Spot on, that is clearly the right machine when you zoom in on the front panel. Oh well, mystery solved. Now I have to decide how to use it in the base 60 world of time.

Grahame

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[Mich...@aol.com]

Angle of sun rays.

Something to do with a greek math guy and measuring mag field on Earth.

 

Michail Wilson
206-920-6312

 

In a message dated 10/29/2016 4:47:38 A.M. Pacific Daylight Time, neoni...@googlegroups.com writes:

I recently bought a Mullard DP7/5 CRT and it came with this strange display graticule

It is a nice snug fit on the CRT so they look like they belong together. Anyone know what it was for or can offer guesses?

Grahame

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[Mich...@aol.com]

Ok, your idea is far better.

 

I was guessing it had something to do with ....

http://images.slideplayer.com/31/9751623/slides/slide_17.jpg

(I remembered the 7.2 deg reference from school where trying to measuring size of the Earth and mag fields.)

 

 

Michail Wilson
206-920-6312

 

In a message dated 10/29/2016 5:32:08 A.M. Pacific Daylight Time, martin....@gmail.com writes:

It comes from a TDMS, Telegraph Distortion Measuring Set  : http://www.albinarrate.com/index.php?option=com_content&view=article&catid=22:vintage&id=35:tdms There were different models all having the same graticule but somewhat differemt designs and used a few types of CRTs.

/Martin

On Saturday, 29 October 2016 13:47:35 UTC+2, Sgitheach wrote:

I recently bought a Mullard DP7/5 CRT and it came with this strange display graticule

It is a nice snug fit on the CRT so they look like they belong together. Anyone know what it was for or can offer guesses?

Grahame

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