🚀 go-pugleaf

In article <1k39s3INN29k@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU (Carl J  
Lydick) writes:

> bright (as is the screen of a storage tube when you clear it), and from my
> recollection of the old radar screens, it erases the images as it passes  
them.

Not on the airborne radar PPIs I stared at for many hours from 1975-1981; they  
did, indeed use a persistent phosphor. I would often adjust the beam intensity  
so I would have a faint ghost of the previous sweep displayed at the same time  
as the bright image from the current sweep --- this often proved handy for  
estimating the speed of the blip.

I'm sure one *could* design a storage tube to do the job, but persistent  
phosphors were quite adequate --- and much simpler, more reliable, and cheaper.

>  
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> Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL
> 
> Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.   
My
> understanding of astronomy is purely at the amateur level (or below).  So
> unless what I'm saying is directly related to VAX/VMS, don't hold me or my
> organization responsible for it.  If it IS related to VAX/VMS, you can try to
> hold me responsible for it, but my organization had nothing to do with it.

Bruce Chapman
Ya gotta be tough to fly the heavies.