General view of a Union Pacific Railroad car featuring Plexiglas panels concealed under metal screens. Per notations accompanying the photograph, this box car was used to test and measure the movement of the panels and…

General view of several unidentified employees installing Plexiglass panels on the nose of a Douglas A-20 attack bomber. Per notations accompanying the photograph, the two halves that form the nose of the bomber are…

General view of an unidentified female employee polishing a curved panel of Plexiglas designed for use as an aircraft windshield. This photograph was likely taken at the Rohm and Haas Company plant located in Bristol,…

General view of an unidentified male employee polishing a curved panel of Plexiglas designed for use on the nose of an aircraft attack bomber. Several finished panels are visible in the background. Per notations…

General view of an unidentified employee fitting a Plexiglas windshield panel onto the nose enclosure of a Douglas A-20 attack bomber. This photograph was likely taken at the Rohm and Haas Company plant located in…

General view of Plexiglas plotting and status boards in use at an Air Force communications school located at Keesler Field in Biloxi, Mississippi. As visible in the photograph, personnel receive reports from radar…

General view of an unidentified employee using a router to smooth the edge of a curved Plexiglas panel designed for use as an aircraft windshield. Per notations accompanying the photograph, the edges of the panels are…

General view of an unidentified employee using a band saw to trim a curved Plexiglas panel designed for use as an aircraft windshield. This photograph was likely taken at the Rohm and Haas Company plant located in…

General view of two unidentified employees making adjustments to a Douglas A-20 attack bomber in production at the Rohm and Haas Company plant located in Bristol, Pennsylvania. Several attack bombers, awaiting…

General view of an unidentified female employee polishing a curved panel of Plexiglas designed for use as an aircraft windshield. This photograph was likely taken at the Rohm and Haas Company plant located in Bristol,…

Aerial view of a Rohm and Haas Company nylon manufacturing plant located in Fayetteville, North Carolina. Rohm and Haas, an international chemical company headquartered in Philadelphia, Pennsylvania, opened the plant in…

Illustrated depiction of the production of Saran Wrap at the Dow Chemical Company in three stages. Stage 1 depicts the harvesting of raw materials, including petroleum and brine, and the manufacture of assorted…

Advertisement for Celluose Acetate manufactured and sold by the Hercules Powder Company for use as a base in plastic molding compounds. The advertisement features artistic renderings of various products made from…

Advertisement for cellulose derivatives, including Nitrocellulose, Cellulose Acetate, and Ethyl Cellulose, manufactured and marketed by the Hercules Powder Company for use in plastic sheeting and packaging materials.…

Advertisement for cellulose derivatives manufactured and sold by the Hercules Powder Company for use as a base in plastic molding compounds, including Nitrocellulose, Cellulose Acetate, and Ethyl Cellulose. The…

Advertisement for Celluose Acetate manufactured and sold by the Hercules Powder Company for use as a base in plastic molding compounds. The advertisement features a hand pulling on a chain link (presumably manufactured…

Advertisement for Celluose Acetate manufactured and sold by the Hercules Powder Company for use as a base in plastic molding compounds. The advertisement features artistic renderings of various plastics products in a…

Four-page promotional booklet advertising various raw materials manufactured and sold the Hercules Powder Company for a range of industrial applications, including pine and paper chemicals, synthetics, pigments,…

The receipt lists materials the De Forest Television Corporation received from Arnold O. Beckman. The memorandum concerns work Beckman performed for the American Television Corporation, the De Forest Television…

Arnold O. Beckman provides an overview of the vacuum film-coating process developed for Lee de Forest. The process successfully coated film with magnesium, lead, bismuth, aluminum, and silver. The letter is apparently…

De Forest inquires about Beckman's progress toward a chemical coating that might change in opacity or color, and details the "very fine and uniform quality" of silver coated film de Forest is able to produce.

Lee de…

The letter discusses the "very nice results" of using new Eastman film and queries as to the possible effects of light upon silvering solution.

Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…

The handwritten document was created in connection with Arnold O. Beckman's consulting work for Lee de Forest.

Arnold O. Beckman, then an assistant professor of chemistry at Caltech, offers his assistance as a consulting chemist.

Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early…

In this letter, Lee de Forest requests a referral to a chemist who might help electroplate film.

Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial…