This is an antique and extremely rare electric bell into bell glass to use with a vacuum pump. Demo device used to show behaviour of sound in vacuum condition. Made during beginning of XX century.
Excellent original antique condition with slight signals of use but complete and working. A really museum piece for demanding collectors. Diameter of bell glass: 17.5 centimeters. If you have any question, please do not hesitate to contact me. Thank you for your visit.The item "ANTIQUE 1900 ELECTRIC BELL INTO BELL GLASS FOR VACUUM PUMP SOUND BEHAVIOUR DEMO" is in sale since Tuesday, August 24, 2021. This item is in the category "Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Other Antique Science Equip". The seller is "rarityland" and is located in Capital Federal. This item can be shipped worldwide.