An Improved Device for Making Harmonic Prints from Radiographs with Great Contrast
Gottfried Spiegler, Paul A Giles · British Journal of Radiology · 1953
A method and a device are described which permit harmonic prints to be made from contrasty negatives. The features of harmonic prints are preservation of good detail with simultaneous compression of the overall tone range. The harmonic picture seems to be the desirable type of the future radiograph.