light box

a boxlike object having a uniformly lighted surface, as of ground glass, against which films or transparencies can be held for examination.

Origin of light box

First recorded in 1840–50

If no light-box is available, a clear window may be utilized in "blocking" the negatives.

The Science of Fingerprints |Federal Bureau of Investigation
A light-box is basically a frosted pane of glass with a light beneath it to produce soft, even, non-glaring illumination.

The Science of Fingerprints |Federal Bureau of Investigation
The form of light-box presupposes the choice of illuminant, and in this there is a wide range.

Bromide Printing and Enlarging |John A. Tennant
Having the light-box, the burners must be placed in it properly.

Bromide Printing and Enlarging |John A. Tennant

If wood is used, the light-box is apt to split under the influence of the heat within.

Practical Cinematography and Its Applications |Frederick Arthur Ambrose Talbot

light box

a light source contained in a box and covered with a diffuser, used for viewing photographic transparencies, negatives, etc