Japanese Navy Instrument with Fitted Case...What is it? Translation needed!

[Ed Hicks]

Japanese Navy Instrument with Fitted Case...What is it? Translation needed!

Large piece about two inches tall and 5 inches across cased...Naval anchor stamp on the label and on the ID plate...Any help is appreciated. Thanks, Ed

[Ed Hicks]

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[Ed Hicks]

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[Ed Hicks]

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[Papa Nambu]

It is a barometer

[Ed Hicks]

Thanks.