Brewster, Sir David, his discovery in biaxal crystals, 209.    From Wordnik.com.  [Six Lectures on Light Delivered In The United States In 1872-1873] Reference

Crystals, rings surrounding the axes of, uniaxal and biaxal, 145.    From Wordnik.com.  [Six Lectures on Light Delivered In The United States In 1872-1873] Reference

That same year Brewster discovered those magnificent bands of colour that surround the axes of biaxal crystals.    From Wordnik.com.  [Six Lectures on Light Delivered In The United States In 1872-1873] Reference