[R-390] Paper on failure modes of mica capacitors (historical)

[jkharvie]

 Jim,A great topic to consider.  I am sure some history books have a number of excellent resources on this topic.  Very early days of understanding what was needed for long term reliability.
Points of divergence and convergence in adopting standards, including those for interoperability, material qualifications, MTBF etc.I am reminded that a number of Apollo missions had a number of "events" identified as being associated with loose material within panel switches that required work-arounds.
In reviewing photographs of early manufacturing it is clear that contamination control and the concepts in improving infrastructure design for contamination control started in early 1960's.  A brief Google search indicates that Willis Whitfield, received a patent for his concept of a "Cleanroom" in U.S. Patent No. 3,158,457 
His design standardized cleanrooms across the globe, enabling better research and development of technology that surrounds us. 

John (N3JKE)

    On Friday, July 5, 2024, 2:40:33 AM EDT, Jim Whartenby via R-390 <r-390 at mailman.qth.net> wrote:   

 This paper is from Great Britain.  I am not sure that they manufactured capacitors with the same materials and technique that the U.S. manufacturers used.  When the Cold War was heating up in the early 1950's all of the U.S. component specs were rewritten to insure the best manufacturing practice for increased reliability.  I am not sure what happened on the other side of the "pond" in this respect.  It seems to me that the vast majority of the component issues were solved in the U.S. by the mid to late 1950s which was when this paper was published.
Perhaps some of our fellow R-390 owners in Great Britain can comment?Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Thursday, July 4, 2024 at 04:06:45 PM CDT, jkharvie via R-390 <r-390 at mailman.qth.net> wrote:  

 As attached
cheers
John N3JKE
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