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National Archives. Washington, D.C., Nov. 22. The documents between two highly polished metal plates and sandwiched between two sheets of cellulose acetate is placed in the hydraulic press

National Archives. Washington, D.C., Nov. 22. The documents between tw...

Public domain photograph, 1910s-1920s portrait, American, free to use, no copyright restrictions image - Picryl description

Government discovers method to preserve movie film indefinitely. Washington, D.C., July 8. People living in the year 2000 will be able to see and hear today's history in the making through experiments on preserving movie film now being conducted by the National Bureau of Standards. The experts at the bureau recently completed "accelerated aging tests in which films in six months went through the effects of 50 years' storage in a cool dark room. These tests showed that cellulose, or explosive film, would last from 50 to 100 years. The new Safety or Acetate film "may be preserved for longer periods." Unofficially, the experts put the figure at several hundred years. The following set of pictures were made at the Bureau of Standards and the National Archives Building. (1) Accelerated aging, The stability of the films is tested similarly to paper. They are heated in this oven at 100 [degrees] C and tested for loss of flexibility and for evidences of chemical decomposition. Arnold Soorne, of the Bureau Staff, is picture making the test

Government discovers method to preserve movie film indefinitely. Washi...

Public domain historical photo, free to use, no copyright restrictions image - Picryl description

National Archives. Washington, D.C., Nov. 22. In the powerful press, the sheets of acetate, under heat and pressure 'melt' into the pores of the paper and adhere to each other as well. One additional advantage of this process is that, after being pressed with the sheets of cellulose acetate, the paper is thinner and takes up less room than it did originally. The result is a sheet of paper and acetate which comes off the polished metal plates as a single sheet. Tests for the aging of this material made by the Bureau of Standards in Washington have shown that this treatment of the paper, called laminating is as permanent as it is possible to make any record of paper

National Archives. Washington, D.C., Nov. 22. In the powerful press, t...

Public domain photograph, 1910s-1920s portrait, American, free to use, no copyright restrictions image - Picryl description

Cosmetics tested at Department of Agriculture. Washington D.C., July 10. In hair dyes and hair tonics there is sometimes found lead acetate, this is absorbed slowly into the system where it accumulates and may result in chronic poisoning. D.H. McCarter, of the Department of Agriculture is shown determining the amount of alcohol in a hair tonic by the method of distillation...

Cosmetics tested at Department of Agriculture. Washington D.C., July 1...

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

National Archives. Washington, D.C., Nov. 22. Preservation of documents has long been a problem in libraries and offices of record. It was once done by a process known as 'crepelining,' which consisted in placing coarsely woven silk over and under the paper to be preserved with the use of adhesive. The most modern process now used is called the laminating process and consists in sandwiching the document between two sheets of thin, transparent cellulose acetate. This is then placed between two highly polished metal plates and subjected to heat and pressure in a hydraulic press

National Archives. Washington, D.C., Nov. 22. Preservation of document...

Public domain photograph of people in office, interior, the 1910s-1920s America, free to use, no copyright restrictions image - Picryl description

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 accoring to the chemical process of making them, acetate, viscose, and nitrate. The acetate base proved to be very stable on heating and is considered suitable for permanent records if properly made. The nitrate base became brittle quite raipidly and is considered unsuited for record purposes. The viscose base is in an intermediate position similar to that of record papers made from ordinary bleach wood fiber, 7/8/38

Government discovers method to preseve film. Folding endurance test, T...

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

July 1, 1941, draft of memo by Alan Lomax regarding the duplication of acetate disks recorded by John Work

July 1, 1941, draft of memo by Alan Lomax regarding the duplication of...

Public domain scan of American Folklife Center document, manuscript correspondence, free to use, no copyright restrictions image - Picryl description.

National Archives. Washington, D.C., Nov. 22. In the powerful press, the sheets of acetate, under heat and pressure 'melt' into the pores of the paper and adhere to each other as well. One additional advantage of this process is that, after being pressed with the sheets of cellulose acetate, the paper is thinner and takes up less room than it did originally. The result is a sheet of paper and acetate which comes off the polished metal plates as a single sheet. Tests for the aging of this material made by the Bureau of Standards in Washington have shown that this treatment of the paper, called laminating is as permanent as it is possible to make any record of paper

National Archives. Washington, D.C., Nov. 22. In the powerful press, t...

A black and white photo of a man working on a machine, Library of Congress Harris and Ewing collection Title from unverified caption data received with the Harris & Ewing Collection. Gift; Harris & Ewing, Inc.... More

July 24, 1941, memo by Alan Lomax regarding the duplication of acetate disks recorded by John Work

July 24, 1941, memo by Alan Lomax regarding the duplication of acetate...

Public domain scan of American Folklife Center document, manuscript correspondence, free to use, no copyright restrictions image - Picryl description.