DescriptionVan Musschenbroek family seal, the Eastern Lamp.png
English: The van Musschenbroek family seal ‘Oosterse Lamp’ meaning ‘Eastern Lamp’ at the base of the 1698 van Musschenbroek vacuum pump. In the lower left corner of the lamp, the crossed keys of the Leiden city arms are engraved. On the lamp it says: “1698, Jan van Musschenbroek Fecit” indicating the creator of the instrument. Johannes often used the abbreviations Johan or Jan, so even though his son Jan van Musschenbroek would grow up to be a very successful and skilled instrumental craftsman himself, it wasn’t him who made the pump in 1698, since he was only 11 years old.
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