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Thread Owner
Some of those toaster ovens have quartz rods. Never tried one.
As for gravity detector, some people would hold a crowbar over their head and walk until they felt the extra weight when over a water source.
"Y"-rods they say will pull down or lift up over a target. I wonder if this is gravity related. Don't discount that a human might be able to detect this slight difference.
I think you're right, I read somewhere it started with 3 springs. The quartz followed, here is an article.It's an unfortunate choice of words. What the article is talking about is an early gravimeter, probably with a quartz spring. RealScience, not WishScience, regardless of the misleading description.