Thomas Edison's Sound Meter. A Machine Which Measured The Vibrational Energy Of Sounds Made By The Voice. From El Museo Popular Published Madrid, 1889 Stock Photo

Stock Photo - Thomas Edison's Sound Meter. A Machine Which Measured The Vibrational Energy Of Sounds Made By The Voice. From El Museo Popular Published Madrid, 1889. Fotosearch

Thomas Edison's Sound Meter. A Machine Which Measured The Vibrational Energy Of Sounds Made By The Voice. From El Museo Popular Published Madrid, 1889

2334507 | Design Pics RM | Rights Managed

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