Search Results
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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…
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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…
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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…
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4 items
Flit Moth Proofer
- Circa 1923
Flit brand insecticide aerosol spray can with red, white, and blue text on red, white, and blue label with marching soldier graphic. Round blue cap.
- Manufacturer Esso Standard Oil Company
- Subject Pesticides, DDT (Insecticide), Insecticides
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3 items
Chase's Products New Insect Bomb
- After 1927 – before 1972
Chase's brand insecticide aerosol spray can with black and white text on black, white, and yellow label. Round red cap.
- Manufacturer Chase Products Co.
- Subject Pesticides, DDT (Insecticide), Insecticides
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4 items
Standard Aerosol Insect Killer
- After 1870 – before 1972
Standard brand pesticide spray can with red and blue text on red, white, and blue label. Standard logo. Round red cap.
- Manufacturer Standard Oil Company
- Subject Pesticides, DDT (Insecticide), Insecticides
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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…
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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…
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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…
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Laboratory work bench with electrolytic apparatus
- 1920s
Close-up view of an electrolytic apparatus at a laboratory work bench attributed to the U.S. Bureau of Standards. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing…
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Laboratory facility attributed to U.S. Bureau of Standards
- 1920s
General view of an unidentified laboratory facility looking toward the chief's office from the perspective of the supply store, with a side view of various offices and work benches. Notably, the photograph is printed as…
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Laboratory facility attributed to U.S. Bureau of Standards
- 1920s
General view of an unidentified laboratory facility looking toward the supply store from the perspective of the chief's office, with inscriptions indicating the location of offices and work benches associated with…
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Laboratory assistant at mixed acid work bench
- 1920s
General view of a laboratory assistant, identified as "Mac May," posed at a work bench for mixed acid materials. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing…
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Laboratory assistant at mixed acid work bench
- 1920s
General view of a laboratory assistant, identified as "Mac May," posed at a work bench for mixed acid materials. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing…
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Laboratory bench attributed to U.S. Bureau of Standards
- 1920s
General view of a laboratory bench with assorted glassware and scientific apparatus. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing address, and postage. While…
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Unidentified woman in laboratory
- 1920s
General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. Notably, the photograph is printed as a…
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Unidentified man in laboratory
- 1920s
General view of an unidentified man, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…
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Unidentified woman in laboratory
- 1920s
General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…
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Unidentified woman in laboratory
- 1920s
General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…
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Unidentified woman in laboratory
- 1920s
General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…
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Unidentified man in laboratory
- 1920s
General view of an unidentified man, presumably a laboratory assistant, seated at a work bench with assorted scientific equipment and glassware. While the setting of this photograph is also unidentified, the photo was…
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Unidentified man in laboratory
- 1920s
General view of an unidentified man, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus, including a microscope. While the setting of this photograph is also unidentified, the…
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Unidentified man in laboratory
- 1920s
General view of an unidentified man, presumably a laboratory assistant, seated at a work bench while examining an unknown substance. While the setting of this photograph is also unidentified, the photo was donated along…
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Sir Joseph Barcroft in laboratory
- 1928
General view of British physiologist Sir Joseph Barcroft (1872-1947) examining a pumping apparatus in a laboratory at Cambridge University. A Fellow of the Royal Society, Sir Barcroft held the chair of physiology at…
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Sir Joseph Barcroft performing splenectomy on dog
- 1928
General view of British physiologist Sir Joseph Barcroft (1972-1947) and an unidentified assistant performing a splenectomy, i.e. the complete removal of the spleen, on a dog. A Fellow of the Royal Society, Sir Barcroft…
