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Two questions: 1.) Is a "spirit level" so called because it is a sealed glass tube containing alcohol?" 2.) Is camber a slight convex curve of a surface, as of a road or an air foil? The lack of response to some Topics may be a problem with superfluous nomenclature. Or, peri***he thought, the subject of the topic might be viewed as "common knowledge" and unworthy for comment. If the value of a "Topic" is judged only by the volume of responders, there would be little to recommend them. I wonder if Albert Einstein would have taken umbrage to the lack of response to his "Theory of Relativity?"
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