You Searched For
Start Over You searched for: Date 1930 to 1939 Remove constraint Date: <span class="from" data-blrl-begin="1930">1930</span> to <span class="to" data-blrl-end="1939">1939</span>-
3 items
Letter from Arnold O. Beckman to R. E. Rose
- 1931-Aug-20
Arnold O. Beckman applied (ultimately unsuccessfully) for a job at E. I. du Pont de Nemours and Company. The letter includes details of his work experience, publications, and educational background, including a…
-
Letter from Lee de Forest to Arnold O. Beckman
- 1936-Nov-10
Lee de Forest states that he returned from a trip to Chicago to find his company in financial disarray. He regrets that Beckman's contracted work was continued, despite an inability to pay for it, and assures him that…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Financial crises
-
Letter from Lee de Forest to Arnold O. Beckman
- 1936-Oct-09
Lee de Forest states that he has "temporarily become disassociated from the activities of De Forest Television Corporation" and advises Beckman to retain any equipment currently in his possession.
Lee de Forest…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Scientific apparatus and instruments, Financial crises
-
2 items
Receipt and memorandum of record
- 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…
- Creator Of Work Beckman, Arnold O.
- Subject Scientific apparatus and instruments, Celluloid, Metal coating
-
2 items
Letter from Lee de Forest to Arnold O. Beckman
- 1936-Jul-02
Lee de Forest discusses testing Beckman's film-coating process with antimony. A sample of antimony paper is included.
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Antimony, Metal coating
-
2 items
Letter from Arnold O. Beckman to Arthur E. Freston
- 1934-May-28
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…
- Addressee Freston, Arthur E.
- Author Beckman, Arnold O.
- Subject Celluloid, Metal coating
-
2 items
Letter from Lee de Forest to Arnold O. Beckman
- 1934-May-10
In this letter, de Forest discusses the possibility of using chemicals to fight forest fires.
Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Fire extinction, Forest fires--Prevention and control, United States. Forest Service
-
Letter from Lee de Forest to Arnold O. Beckman
- 1931-Nov-09
In this letter, de Forest proposes a process that could replace halftone film.
Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial business ventures…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Photoengraving--Halftone process
-
2 items
Letter from Lee de Forest to Arnold O. Beckman
- 1931-Oct-22
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…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Silver films (Metal coating), Silvering, Celluloid
-
Letter from Lee de Forest to Arnold O. Beckman
- 1931-Oct-09
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…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Silver films (Metal coating), Silvering, Celluloid
-
Letter from Lee de Forest to Arnold O. Beckman
- 1931-Sep-09
The letter requests deliverables of 100 feet of silvered film, and two 10 foot pieces with a silver coating on emulsion film and clear stock.
Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…
- Addressee Beckman, Arnold O.
- Author De Forest, Lee, 1873-1961
- Subject Silver films (Metal coating), Silvering
-
3 items
Formula for silvering film
- 1931-Aug-25
The handwritten document was created in connection with Arnold O. Beckman's consulting work for Lee de Forest.
- Creator Of Work Beckman, Arnold O.
- Subject Silver films (Metal coating), Silvering, Celluloid
-
Letter from Arnold O. Beckman to Lee de Forest
- 1931-Jul-18
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…
- Addressee De Forest, Lee, 1873-1961
- Author Beckman, Arnold O.
- Subject Celluloid, Electroplating
-
Letter from Lee de Forest to the Dean of Chemistry at Caltech
- 1931-Jul-15
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…
- Author De Forest, Lee, 1873-1961
- Subject Celluloid, Electroplating
-
3 items
Beckman pH Meter (Laboratory Model) brochure
- 1935 – 1940
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…
-
3 items
Beckman pH Meter (Industrial Model) brochure
- 1935 – 1940
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…
-
4 items
Beckman pH Meter (Glass Electrode) brochure
- 1935 – 1940
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…
-
New! Inexpensive continuous pH measurements with the Beckman glass electrode equipment!
- Bulletin No. 17
- 1935 – 1940
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…
-
2 items
Beckman Quinhydrone pH Meter
- 1935 – 1940
The quinhydrone electrode in this instrument was an alternative to Beckman's glass electrode. Quinhydrone electrodes are not reliable at measuring a pH greater than 8, at measuring solutions with strong oxidizing or…
-
8 items
The Beckman pH Indicator for Continuous Measurement of pH with the Glass Electrode
- Bulletin 16
- 1939
The brochure details the components and specifications of the Model R pH meter, manufactured by National Technical Laboratories and branded as a "Beckman pH Meter."
Arnold Beckman invented his first pH meter in 1934 at…
-
Directions for Beckman pH meter (Laboratory Model)
- 1938
This page of instructions would have been located inside the lid of the pH meter, so that users would be able to read the instructions upon opening its case.
Arnold Beckman invented his first pH meter in 1934 at the…
-
Directions for Beckman pH Meter (Industrial Model)
- 1937-Dec
This page of instructions would have been located inside the lid of the pH meter, so that users would be able to read the instructions upon opening its case.
Arnold Beckman invented his first pH meter in 1934 at the…
-
5 items
A Discussion of pH Measurement Methods
- 1936-Aug
This report outlines the colorimetric and electrical ways to determine the pH of a solution and the various kinds of electrodes that can be used with electrical instruments. Beckman concludes that a method using glass…
-
Buffer Solutions
- 1939-Oct
Written by NTL (the precursor to Beckman Instruments, Inc.), this document outlines new standards for buffer solutions used in pH meters.
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist…
-
Electrode Case Beckman pH Meter diagram
- Dwg. No. 293-000239
- 1935-Oct-11
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…