What is the purpose of a plumb bob in construction? What are its types and how does it work? - Quora

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How did ancient people make sure their buildings were accurate (level, plane, walls at a right angle)? How did they create the tools necessary to do so? - Quora

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Plumb bob - Wikipedia

What is an overlooked tool of carpentry? - Quora

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The Plumb Line

Bob Flynn - same on bloosky on X: Dug in a little more because I was curious. First off, it's 'Plumb' line. And there is mention of it in classical figure drawing.

Rocky Road Devotions: The Gospel Plumb Line

Plumb Line - Posterior View - Project & Report

532 Bob Plumb Line Royalty-Free Images, Stock Photos & Pictures