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What if your staff is not perfectly plumb vertically?
The staff, called a story pole, has a set of bubble levels on it that help you keep it plumb. Obviously the closer to plumb you keep the story pole, the more accurate your readings will be.
What if your staff is not perfectly plumb vertically?
The staff, called a story pole, has a set of bubble levels on it that help you keep it plumb. Obviously the closer to plumb you keep the story pole, the more accurate your readings will be.