The Magma Copper Mine AC system designed by the Carrier Corporation was the first underground mechanical air conditioning system in North America. The initial installation of refrigerated cooling equipment in the Magma Mine at Superior, Arizona was necessary due to the increase in temperature lower into the mine. Below the 2000-foot level, the increase in rock temperature is approximately 1½ degrees F. per 100 feet of depth. The rock temperature on the 2000-foot level is 109°.
1930-1949
William J. Conroy Of Aylmer, Quebec, Received Patent No. 465,127 On The First Field Hay Chopper On 15 December, 1891. Its Sickle Cut The Crop, Which Was Elevated Directly Into A Cylindrical Curved-Bar Cutterhead. It Was Not Commercially Successful, But It Recognized The Need.
Professor Floyd Waldo Duffee, Agricultural Engineering Department, University Of Wisconsin, Built And Field Tested A Silo Filler With An Attached Hay Loader In 1926. He Presented The Specifications Of A Complete Unified Harvester To The National Asabe Meeting In 1927.
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Image Credit: Courtesy Flickr/Bob Adams (CC BY-SA 2.0)Image Caption: Claas Jaguar 870 forage harvester with pickup header
1988
Tests Of Grain Aeration To Cool And Dry Combine-Harvested Wheat By F. L. Fenton, C. O. Swanson, And Orval C. French At Kansas State University In 1930-31 Showed Mechanical Ventilation To Be More Effective Than Natural Draft Ventilation. Mechanical Aeration Was Further Developed In The 1940's To Prevent Moisture Migration, Which Caused Wetting And Spoilage Of The Top Layers Of Stored Grain. Studies In 1944-45 By Usda Agricultural Engineers G. W. French And W. V. Hukill Cooperating With Iowa State University Proved That Mechanical Aeration Prevented Moisture Migration. G. H.
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2001
San Antonio's River Walk, a catalyst for abundant commercial and tourism enterprise, is generally regarded by cities and urban planners throughout the world as a prototype for the development of urban riverfront sites. The River Walk's success, however, would not have been possible without a series of flood-control and architecture projects completed in the first half of the 20th century that relied heavily on civil-engineering expertise.
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Image Credit: Courtesy Flickr/Tim Pearce (CC BY 2.0) Image Caption: San antonio texas river walk 2011 riverwalkEra_date_from: 1929
1996
When Arnold Beckman, a professor of analytical chemistry at the California Institute of Technology, was asked to devise a way to measure acidity in citrus fruit, the resulting “acidometer” revolutionized chemical instrumentation. The innovative features of the pH meter, including its use of integrated electronic technology and all-in-one design, were the basis for subsequent modern instrumentation developed by Beckman and his company.
The plaque commemorating the development reads:
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Image Credit: Courtesy Science History InstituteImage Caption: Chemist George Garcelon using a portable Beckman pH meter in laboratory, 1951. Interior of Research Laboratory, Althouse Chemical Plant, 500 Pear Street, Reading, PennsylvaniaEra_date_from: 1936
2004
Steroid chemists often refer to the 1930s as the Decade of the Sex Hormones, when the molecular structures of certain sex hormones were determined and first introduced to medical practice as drugs. Russell Marker achieved the first practical synthesis of the pregnancy hormone, progesterone, by what now is known as the "Marker Degradation." Produced from starting material in a species of Mexican yam, Marker’s progesterone eventually became the preferred precursor in the industrial preparation of the anti-inflammatory drug cortisone.
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Image Caption: Marker DegradationEra_date_from: 1938–1945
1999
Innovations
Steroid chemists often refer to the 1930s as the Decade of the Sex Hormones, when the molecular structures of certain sex hormones were determined and first introduced to medical practice as drugs. Russell Marker achieved the first practical synthesis of the pregnancy hormone, progesterone, by…
Read More
When Arnold Beckman, a professor of analytical chemistry at the California Institute of Technology, was asked to devise a way to measure acidity in citrus fruit, the resulting “acidometer” revolutionized chemical instrumentation. The innovative features of the pH meter, including its use of…
Read More
San Antonio's River Walk, a catalyst for abundant commercial and tourism enterprise, is generally regarded by cities and urban planners throughout the world as a prototype for the development of urban riverfront sites. The River Walk's success, however, would not have been possible without a…
Read More
Tests Of Grain Aeration To Cool And Dry Combine-Harvested Wheat By F. L. Fenton, C. O. Swanson, And Orval C. French At Kansas State University In 1930-31 Showed Mechanical Ventilation To Be More Effective Than Natural Draft Ventilation. Mechanical Aeration Was Further Developed In The…
Read More
William J. Conroy Of Aylmer, Quebec, Received Patent No. 465,127 On The First Field Hay Chopper On 15 December, 1891. Its Sickle Cut The Crop, Which Was Elevated Directly Into A Cylindrical Curved-Bar Cutterhead. It Was Not Commercially Successful, But It Recognized The Need.
… Read More
The Magma Copper Mine AC system designed by the Carrier Corporation was the first underground mechanical air conditioning system in North America. The initial installation of refrigerated cooling equipment in the Magma Mine at Superior, Arizona was necessary due to the increase in temperature…
Read More