نصب المقياس على دجلة

نصب المقياس على دجلة

تقریباً 905 عیسوی · 293 ھ

بغداد

In 293 a gauge was set up on the Tigris spanning both banks, twenty-five cubits long — a round mark at each cubit and a square mark every five, with iron inscriptions, to read the river's rises ¹.