Scotograph

Scotograph or writing-machine for use of the blind

Source: wiktionary

In some recent experiments with it at the Blind Asylum at Amsterdam, children of 6 learned very rapidly to write with the assistance of the scotograph, which is the invention of Dr. Nord, but it is especially designed for the use of scholars, etc., who have become blind late in life and still wish to continue their literary activity.

Source: wiktionary

"Scotograph" is likely to stick as the popular term for portraits taken by the Röntgen process. It means "shade picture," and its analogy with photograph, which is a "light picture," is sufficiently manifest to help on its vogue.

Source: wiktionary

You will be able to see radiographs, or scotographs, — referring to darkness and shadow ; you will see that shadowgraphs indicate to you any deformity of the roots of the teeth, or any teeth that have not come into position in the arch, or any osseous deformity which may take place in the jaw […]

Source: wiktionary