File:EB1911 Hydrometer - Boyle’s New Essay Instrument.jpg
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![File:EB1911 Hydrometer - Boyle’s New Essay Instrument.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/EB1911_Hydrometer_-_Boyle%E2%80%99s_New_Essay_Instrument.jpg/307px-EB1911_Hydrometer_-_Boyle%E2%80%99s_New_Essay_Instrument.jpg?20181201163324)
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