Paint Manufacturers' Association of the United States. Scientific Section · Philadelphia, PA : Paint Manufacturers Association, Scientific Section · leaf 46
igations into the nature of light have proven that it is the ultra violet invisible rays that are most en.ergetic in setting up chemical action. These rays are also called actinic rays. It is the actinic rays which aliect the photographic plate and give rise to many chemical reactions —… … Atlantic City Fence Before Placing Panels 12
Paint · Painting, Industrial · Corrosion and anti-corrosives
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
