Mystery Object of the week #11

This weeks ‘mystery object’ of the week plays around with volume.   If you think you know what it is we’d love to hear from you.

emiat-73-croppedClue …………….prior to the development of electrical amplification this machine was the most effective attempt in increasing the sound volume!

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6 thoughts on “Mystery Object of the week #11

  1. It it an amplifier using a carbon microphone whose diaphragm driven electromechanically by the incoming signal to be amplified? And who says thermonic valves gave us the first amplifying device?

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