Re: Military AVO 8 Questions
I don't think this is specifically a NATO feature but a feature of the earliest Model 8 Mk V instruments. It may have been retained on later NATO versions or perhaps the push-on push-off style was found to be more acceptable for the commercial market.
I have somewhat vague memory of an AVO sales rep. visiting the Polytechnic where I was a (slightly) mature student at the time. i.e. Having had a real full time job before joining the course concerned. This would have been around 1971/2. Unusually some of us were invited to see this redesigned Avo meter and I seem to remember that the demonstration model had the quarter turn locking Rev MC button.
PMM
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