I wrote a piece on Sperry-Rand and the 1955 electrogravitics research trend.

https://blockedepistemology.substack.com/p/puzzle-filling-le...

Some great 1955 articles by aerospace journalist Ansel Talbert cited & linked to from archives in it. Warning, the overall substack series is on UAP, a topic which HNers often find uncomfortable. So if the UAP theme offends sensibilities, don’t click through.