In 1973, Harris and Cabri defined the following names for Os-Ir-Ru alloys: ruthenosmiridium was applied to cubic Os-Ir-Ru alloys, where Ir < 80% of (Os+Ir+Ru) and Ru > 10% of (Os+Ir+Ru) with no single other element >10% of the total; Rutheniridosmine was applied to cubic Os-Ir-Ru alloys, where Os < 80% of (Os+Ir+Ru) and Ru is 10–80% of (Os+Ir+Ru) with no single other element >10% of the total; the Ru-Os alloys be known as ruthenian osmium (>50% Os), osmian ruthenium (>50% Ru); the Ru-Ir alloys be known as iridian ruthenium and ruthenian iridium where the boundary between them is defined by the alloy's miscibility gap (a minimum 57% Ir for ruthenian iridium and a minimum of 55% Ru for iridian ruthenium).