Experiment ot show that sound needs a medium in which to travel. When air in jar is in normal state the bell is audible. When air is evacuated no sound is heard. From ''Sound'' by John Tyndall, London, 1867.
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Image Number: 1746-19690111Rights ManagedCredit Line:World Hirsory Archive/Image Asset Management/World History Archive/SuperStockCollection:Image Asset Management Contributor:World Hirsory Archive Model Release:NoProperty Release:NoResolution:3438×6099
