An Antique Vacuum Pump for physical science experience. The instrument consists of a brass pump with a metal base on which rest a glass Barrel . The instrument is based on a mahogany base. The air contained in the sphere is pumped creating a vacuum. Signed by retailer M. Prins – Leermiddelen – Dordrecht. About 1900/1910. Measurements 60 x 23 x 34 cm.