Explanatory notes
… usually made of glass (though some may be of metal, e.g., nickel‑silver, silver, etc.), and weighted at one end with … Baumé, Brix, Balling, Bates, Gay‑Lussac, Richter, Tralle, Sikes, Stoppani, etc.). Nicholson’s hydrometer is used for … platinum with rhodium‑platinum; copper with copper‑nickel; iron with copper‑nickel; nickel‑chromium with …