Vacuum Pump and Bell Jar
A brass hand pump with turned hardwood handle, mounted at an angle on a 10" x 6" wood base, with 5" diameter brass plate and 9 1/2" tall bell jar with rubber stopper and glass tubes allowing entry of two copper wires. The wires likely powered a "trembler" or vibrating electric bell to demonstrate the absence of sound in a vacuum. The pump, valve, and relief screw are all in good working order. The air tube and base are black enameled brass, the other parts are bright brass.
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