BSTJ 3: 4. October 1924: "The Stethophone," An Electrical Stethoscope. (Frederick, H.A.; Dodge, H.F.) : Free Download, Borrow, and Streaming : Internet Archive
![How Sound Travels Sounds are carried by vibrating particles. Sounds can travel through: 1.Gases ( air in the room ) 2.Liquids ( water in a swimming pool. - ppt download How Sound Travels Sounds are carried by vibrating particles. Sounds can travel through: 1.Gases ( air in the room ) 2.Liquids ( water in a swimming pool. - ppt download](https://images.slideplayer.com/25/7952643/slides/slide_2.jpg)
How Sound Travels Sounds are carried by vibrating particles. Sounds can travel through: 1.Gases ( air in the room ) 2.Liquids ( water in a swimming pool. - ppt download
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