Oil-Based Sprengel Pump Really Sucks

?w=800" alt=""/>Have you heard of the Sprengel pump? It’s how they drew hard vacuum back before mechanical pumps were perfected — the first light bulbs had their vacuums drawn with Sprengel https://hackaday.com/2025/09/17/oil-based-sprengel-pump-really-sucks/

https://hackaday.com/2025/09/17/oil-based-sprengel-pump-really-sucks/