You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Sprengel pump is very easy vacuum pump all need is glass tube and mercury.
you will have hard vacuum pump.in hard vacuum you get early filament lamps and Vacuum tube. earlier discovery of electron and x-ray. sprengel pump was first made in 1865. let say what it was made 50 years earlier in 1820. you can advance electronic with almost 50 years.