In premodern engineering they used twelfths. The foot ', inch '', line ''', and point '''' were each 1/12th of the previous unit. (Yes, they used quad prime mar

In premodern engineering they used twelfths. The foot ', inch '', line ''', and point '''' were each 1/12th of the previous unit. (Yes, they used quad prime marks.) European typographic points were 1/144th of an inch. https://dozenal.org/ https://dozenal.org/