An 18th Century brass rule, engraved on one side with a 0-12 scale subdivided into 12ths, the other side inscribed Mafs des bis anhero Observirten und Pafsauerifchen Anno 1752 auf das Neue Stabilirten Werck Schuchs and I D D G S R E, C.de Lamberg de W &H Ingenieurs E E & S R I P. Pafsaviensis & c