Image: Centrolinead
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Description: The Centrolinead, a draughtsman's instrument invented by British engineer, architect and mathematician, Peter Nicholson (1765–1844)
Title: Centrolinead
Credit: Illustration from the book "Practical Geometry" (https://books.google.com/books?id=FetJAAAAMAAJ&pg=PA42)
Author: Thomas Bradley; Peter Nicholson
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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