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As has been mentioned, there were "corrosion problems", I have no idea of what sort or of why, with the magnesium metal or alloy slide rules, which were eliminated or avoided with the aluminum alloy slide rules they went to later on. I had 2 Pickett slide rules, one a 10", rather basic type I believe, now in the hands of a nephew, and a fancier 5" model that somewhere along the line, went lost, or possibly ended up in the hands of someone who saw it, and couldn't resist the temptation. Of course, I might have simply misplaced the thing. The 5" rule, as I remember, tended to be "sticky", not at all the case with wood body rules. I've heard some people speak very highly of the Pickett rules, though frankly I never had that much experience with them. Of course, while they still work as well as they ever did, batteries not required either, slide rules, "stick" or circular, are curiousities today, as might be the case tomorrow or the day after with electronic calculators that are all the rage these days. Brighter heads than I can only guess.

Alan

Alan