Posted by Bill Plumpe on September 13, 2009 at 14:13:28:
In Reply to: Re: Help with antique centrifuge model - Central Scientific apparatus
That is a vacuum pump, used for classroom demonstrations. A bell jar is placed on the round platform and the air is pumped out by hand. Many variations of this unit have been made. I may have a CENCO catalog listing or a Welch one that is similar. Bill