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[Phys-L] Antique Gas Pump Question



I'm looking a picture of a gas pump from the 1920's. It has a globe at the
top of it and a set of numbers inside of the globe. Does anyone know how
these "antique" gas pumps worked?
-Tony

The pump's picture is located at
http://www.pennswoods.net/~rnorton/P1000023.JPG