Wilhelm Conrad RÖNTGEN (1845-1923)

CONSTRAINT : choice of subject dependent on : 1°, wavelength of electro-magnetic radiation (in this case, x-rays) used as light source ; and 2°, extent of variation in the resistance to the absorption and reflection of this radiation across surface area.

INVENTION : x-ray ϕ (1895).

WORKS : female nudes, anatomical studies. His school is still at work today, though one regrets that their negatives are never printed as positives (with the exception of those of UMBO).