Memorial Stone of Pascal's Experiments — Puy de Dôme — Publisher S.P.A.D.E.M. No. 298

Description

Memorial stone commemorating Pascal's experiments on atmospheric pressure, executed by his brother-in-law and the Minim Fathers on September 17, 1648. Printed text on the reverse specifies the publisher S.P.A.D.E.M. Paris and the sculptor R. Mabru. Blue postmark from the Puy-de-Dôme Observatory with cancellation.