Government discovers method to preserve film. Scratch resistance, film, particulary the emulsion side, may become damaged through scratching. D. Levinsky of the Bureau is using an instrument which tests the resitance of a film by measuring the width of a scratch produced by a diamond point under a g

Government discovers method to preseve film. Folding endurance test, The flexibility is measured in this folding endurance tester. A strip of film is folded back and forth under tension until it breaks, and the number of folds it withstands is counted. Three types of films have been studied, termed

Government discovers method to preserve. (3) Test for fading. D. Levinsky of the Bureau of Standards is pictured exposing a developed film to light from a carbon arc to find whether the photographic image fades. The carbon-arc light simulates daylight closely and therefore is used for many mate

Government discovers method to preserve film. (2) Expansion and contraction, like paper and other sheet materials made from cellulose, films expand as they take up moisture and contract as they lose it, and the extent of the change is different in the two directions of them. This may cause some dist

Interferometer tests standard gages for automobile manufacturers. Washington, D.C. May 28. I.J. Fullmer of the Bureau of Standards is shown with an interferometer by means of which differences in length are measured in terms of wave-lengths of light to the millionth of an inch. A four-inch square pr

Inspects film for $3,000,000 map. Photographs for the map are made on a huge roll of film by the aerial cameramen. C.E. Kowaloczyk, AAA worker, is shown inspecting the film for flaws before it is sent in the laboratory to be printed, 7/28/37

Machine performs half a day's manual labor in 5 minutes. Washington, D.C., Dec. 22. H.J. Keegan of the U.S. Bureau of Standards, using the spectrophotometer to determine the different colors in a piece of cloth. It formerly took a man a half a day to make this spectrum analysis but now the machine d

Bureau of Standards speeds up photomicrography with new apparatus. Washington, D.C., Aug. 18. By means of this new apparatus just designed by the metallurgical divisions of the National Bureau of Standards, it is now possible to make 700 micrographs per working day of the structural effect of corros

Testing airplanes lenses used in map making. Washington, D.C., May 6. Dr. F.E. Washer of the U.S. Bureau of Standards testing the lens for the airplane cameras that are used by the Army and Navy. There are lights in the rear of the columnmeters and exposures are made on the photographic plate in fro