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Roman bronze plumb-bob from Redbourn
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Groma
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Roman lead plumb bobs (perpendicula) in the form of amphorae
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Roman plumb-bob
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Roman plumb-bob
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Babylonian cuneiform tablet recording a survey of the walls of Babylon
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Babylonian cuneiform tablet with a plan of the Tuba district of Babylon on modern plan
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Babylonian cuneiform tablet with a plan of the Tuba district of Babylon
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Roman bronze plumb-bob from Viroconium
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Archaic(?) bronze plumb-bob from Lindos