Antique Magdenburg globe, Mr. Sandwijk.
A well-known instrument maker that was then located in the Jonker Fransstraat 93 in Rotterdam.
The Magdeburg hemispheres are two separate hemispheres of strong material that are held against each other, after which the space inside the resulting ball vacuum is sucked. Due to the air pressure on the external surface, the hemispheres are pressed against each other.
This test was carried out for the first time by Otto von Guericke, the then Mayor of the German city of Magdeburg, in 1654. Sixteen horses were not able to separate the two hemispheres with a diameter of ca. 50 cm. The force that had to be overcome amounted to more than 20,000 N, which is equal to the weight of a mass of 2 tons. In this way, Von Guericke demonstrated the amount of the air pressure at ground level, which is the result of the weight of the earth's atmosphere. Von Guericke developed into the founder of the vacuum technology.
The spheres on the image have a diameter of 9 cm
- Maagdenburger bol, Rotterdam
- Brass, Iron (cast)
- Manufacturer/ Brand
- M. Sandwijk.
- Estimated Period
- Early 20th century
- Country of Origin
- Good condition - used with small signs of aging & blemishes
- 9×28×8 cm
- 1050 g