Hydrometer

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Brass hydrometer in a fitted wooden box.
Inscriptions:
NEGRETTI & ZAMBRA LONDON
SPECIFIC GRAVITY 1024 to 1031. Temp 60"

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ID:	NAV0989
Collection:	Oceanography
Type:	Hydrometer
Display location:	Not on display
Creator:	Negretti & Zambra
Date made:	circa 1902
Credit:	National Maritime Museum, Greenwich, London. Donated by Marine Scotland Marine Laboratory.
Measurements:	Overall: 300 mm; Diameter: 28 mm