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Ten bottles containing a series of alloys of potassium nitrate (nitre) with lead nitrate showing the temperature at which solidification begins on cooling the fused alloy

Ten bottles containing a series of alloys of potassium nitrate

1885
Seven glass tubes showing continuity between aqueous solution and igneous fusion in the case of saltpetre (potassium nitrate)

Seven glass tubes showing continuity between aqueous solution and igneous fusion in the case of saltpetre

1885