Georg Wulff

Wulff was born in Nizhyn, Chernigov province where his mother Lydia was daughter of teacher E. V. Gudim.

His father Viktor Konstantinovich Vulf was a literature teacher at the 6th Warsaw Gymnasium.

In the third year, he studied the electrical properties of quartz for which he received a gold medal.

He began to study the relationship of crystal structure and optical properties and in 1888 he published a paper on the "theory of rotatory polarization".

[1] Wulff studied crystal growth processes and modified Curie's principle on the minimization of surface energy.

He developed a relationship in X-ray diffraction (nλ = 2d sin θ) which was also found independently by the Bragg father and son duo in 1913 and sometimes called the Bragg–Wulff equation.

Wulff in 1912
Ukrainian envelope commemorating the 150th birth anniversary of George Wulff