Zirconia Light
an intensely brilliant light differing from the Drummond light mainly in the employment of cones of the oxide of zirconium instead of the less durable cylinders of lime. In 1867 Tessié du Motay introduced this light into Paris, and it was there employed for several years to illuminate squares and public buildings and gardens. The cones were formed of burnt zirconia kneaded into a paste withaqueous boracic acid, and hardened in iron molds at a red heat, and a mixture of oxygen and a highly carburetted gas was burnt to raise the cones to incandescence.
The light was also once used as an illuminant in public places of Brussels and Vienna, and in the United States in lighthouses and public works.