The Nuttall Encyclopedia
An intensely brilliant light, similar to the Drummond light, but differing from it chiefly in the employment of cones of zirconium instead of cylinders of lime; it has been superseded by the electric light.
Wood, James, ed. Entry for 'Zirconia Light'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/z/zirconia-light.html. Frederick Warne & Co Ltd. London. 1900.