Microphone for echo sounder

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Microphone used for estimating ship's noise. Used in sounding tubes leading to ship's tanks.

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ID:	NAV0678.1
Type:	Microphone for echo sounder
Display location:	Not on display
Creator:	Unknown
Date made:	1926
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 100 mm x 245 mm x 104 mm x 105 mm
Parts:	Microphone for echo sounder Microphone for echo sounder (NAV0678.1) Echo sounder (NAV0678.2) Echo sounder (NAV0678.3)