- Circa 1936
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…
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…
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…
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.
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…