Vacuum Pumps
Mercury Diffusion Pump
This Kurth-Ruggles type of Mercury Diffusion Pump was built in the glass shop here and was used by Professor Charles Richardson for high vacuum work in the 1960s and 70s.
Vacuum Pump
This vacuum pump was used for physics demonstrations in this department in the very early part of the 20th Century. The following description is reproduced from the Kenyon college website with kind permission from Professor Thomas Greenslade Jr. “The apparatus catalogue of Max Kohl of Chemnitz Germany, issued ca. 1900, lists this apparatus as a “Duplex pump, specially designed for the rapid production of very high vacua, suitable for exhausting incandescent lamps and Roentgen tubes.” Its cost was 355 marks or $90” ($2915in 2007 currency)