CYGN-B

[james]

Have you ever heard of GoldWave? It's a rather unique wav editor that has a very well designed expression evaluator. You can do all kinds of neat math on wav data. You could experiment with rectifying and smoothing those signals to see if that gets you anything useful.

[Greg]

Have you ever heard of GoldWave? It's a rather unique wav editor that has a very well designed expression evaluator. You can do all kinds of neat math on wav data. You could experiment with rectifying and smoothing those signals to see if that gets you anything useful.

I haven't. That's a good tip. There is a lot of material I have been entrusted to preserve, and I'm mostly interested in the 6B / 352 parts of the story. I'd offer a pair of tracks to someone who cares to experiment on this problem. Individual would have to be a demonstrated evangelist for wav files.

[james]

Individual would have to be a demonstrated evangelist for wav files.

I can't imagine who that might be.

[ronhip]

Being a Zeiss "fanboy" is a great thing. Without Zeiss, we probably would not have projection planetaria today - first one in 1923! (Not to mention all the other optical innovation the company has come up with...) When you see the Zeiss name on a product, you can be assured of quality. Have you ever seen a copy of the book "Window to the Universe" written by Charles Hagar and published by Zeiss in 1980? I suspect it may be a bit hard to find - even from Zeiss - though you can find a nice excerpt here with other good history articles:

https://cdn.ymaws.com/www.ips-planet...3-Sept1973.pdf

I was one of Charles Hagar's students at San Francisco State University. He was an inspiring teacher.

Technically, I work for an exclusive distributor of the Zeiss Planetarium Division. (USA & Canada) Seiler's founder apprenticed at Zeiss and after WWI, studied in Jena, and earned his Master's in Fine Optics. He immigrated to the US in 1925 and started Seiler Instruments in 1945. And yes, you can call me a Zeiss "fanboy". It's a very cool company, with an amazing history...

[laserist]

I may have a copy at home, or I may have given my copy to Howard George. We gave some away at the Zeiss booth at the last IPS conference I attended in Warsaw 2016. I had a copy of Dr Meier's book the Heavens on Earth, but I don't speak/read German so I gave it to a customer back in the 90's when I sold the Zeiss APQ telescopes. I've seen one of the two Mark I's at the optics museum in Jena, and I saw a ZKP-I in Warsaw. That was a trip - the museum was from the USSR era and looked like a time capsule... The new museum hosting the IPS convention was state of the art. My favorite exhibit was a 1 meter square cloud chamber.

[ronhip]

We have a cloud chamber that size at the Exploratorium. It's one of my favorite exhibits.



Ron

I may have a copy at home, or I may have given my copy to Howard George. We gave some away at the Zeiss booth at the last IPS conference I attended in Warsaw 2016. I had a copy of Dr Meier's book the Heavens on Earth, but I don't speak/read German so I gave it to a customer back in the 90's when I sold the Zeiss APQ telescopes. I've seen one of the two Mark I's at the optics museum in Jena, and I saw a ZKP-I in Warsaw. That was a trip - the museum was from the USSR era and looked like a time capsule... The new museum hosting the IPS convention was state of the art. My favorite exhibit was a 1 meter square cloud chamber.

[mixedgas]

What does a Laserium Test pattern look like? I have a G120 based Laserium scan system to test, 1 head and blanking.

How did Laserium overlap their scan pairs? Was it the standard test pattern or another means?

Stev e

[mixedgas]

I can't imagine who that might be.

You'd probably over process it James. The secret of many older shows lies in the tuning and mechanics of the scanners. It is not all about the "vertices" in this case.

Steve

[mixedgas]

PS, anyone want to own up about a Laserium residency in Cleveland in the past?

Specifically using the gear in the attached picture?


Steve

[laserist]

What does a Laserium Test pattern look like? I have a G120 based Laserium scan system to test, 1 head and blanking.

How did Laserium overlap their scan pairs? Was it the standard test pattern or another means?

Stev e

Laser Images used open loop G124s in the Mark VI's originally. The also used what they called a PDM scanamp that was crazy complex. There were something like 30 active components in the feedback loop. The alignment pattern was just a square wave where you set the ringing to be symmetrical.

As for overlapping scan pairs their xy zeros were superimposed. There were several fixed rotations available via the hybrid card cage and a different fixed rotations available via override. When the two were summed and individual gains were ramped - interesting things happened...