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Glass-stoppered bottle containing iridium

1801-1892 (prepared)
Pure iridium. Presented by Johnson, Matthey and Co., 1885

Pure iridium. Presented by Johnson

before 1889
Iridium obtained at the bottom of the crucible in melting Siberian gold at the Russian Mint. Presented by Sir C. Wheatstone

Iridium obtained at the bottom of the crucible melting Siberian gold at the Russian Mint

before 1889
Torpedo boat liquid compass on gimbals, pattern no. 24, with iridium pivot designed to reduce vibration in fast vessels. By E Dent & Company Limited, London, 1875-1885.

Torpedo boat liquid compass on gimbals, with carry case

1875-1885