Radiographic centers would have the function of maintaining a file of radiographs of art objects, of copying them in reduced format and of furnishing copies for sale or comparative viewing. Primary centers would maintain master copies and look after duplication as well as providing storage and viewing facilities. Secondary centers would provide a sales and storage and viewing service. Two types of copying machines producing transparencies of 100 x100 mm and of 4 x 5 inch are mentioned; the cost per film might be 25-40 depending on the demand. The illustrations are black white transparent copies of a radiograph by the two machines.