Hi Brian, 
 
I can only speculate on the technique used but I several years ago on  a trip 
to the UK, I was shown a thin metal foil mask that was a near  filigree of 
approximately 25 micron holes that was reportedly produced at  Cambridge in 
early 1945. It looked like solid metal until you held it to the  light. I can't 
recall the purpose but I seem to recollect that it was in  support of US atomic 
research. 
 
Lining up with the thoughts others have expressed, if not a full bio,  
certain your technical memoir would interest many folks. If seems that you would  
have good start by collecting the great reminiscences you have already shared  
here in the past. 
 
BTW, Ken Gilleo has put together a nice collection of stories about  
technical sleuthing titled: "The Day Niagara Falls Turned Green" It can be  downloaded 
at no charge from his website _http://www.et-trends.com/_ 
(http://www.et-trends.com/)  
 
Following is from the ET Trends website:
 
"They (the stories) are taken from the vast world of industry and  commercial 
enterprise. The engine that powers the world is industry and it must  keep 
running smoothly or the civilized world grinds to a stop. When a factory is  
shut down, there are usually dire consequences. 

Our heroes are  mostly unsung since they are the engineers, technicians and 
ordinary workers who  have had to jump in when things go amiss as they so often 
do. Enjoy these case  histories and you need not be an engineer or scientist 
to understand the problem  and to appreciate the solution." 

Ken is seeking stories for a future edition and I am certain you and others  
here have many to share with him. 
 
Best, 
Joe 



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