They thought that improved knowledge about carbon emissions and the global climate was imperative. Included in the collection are Elliott’s letters to his colleagues, which reveal that he and others were anxious about the possible hazards that climate change posed. CDERA was a remarkably early effort to conduct research on the effects of carbon dioxide and climate change across many different scientific fields.ĪIP Emilio Segrè Visual Archives, Machta Lester A1. It was established specifically to fund and organize research on anthropogenic climate change. The bureaucratic name hides the significance and importance of the program’s mission. In the late 1970s, along with a group of other prestigious climate scientists including Lester Machta, Wallace Broecker, program manager David Slade, and others, Elliott helped organize the Carbon Dioxide Effects Research and Assessment Program (CDERA) in the newly-formed Department of Energy. Elliott was an atmospheric physicist who worked at the National Oceanic and Atmospheric Administration (NOAA). Elliott Papers.Ĭlick here to read the transcript of an oral history interview with William Elliott, conducted by Spencer Weart. For every truly useful and interesting document there are thousands of letters that state something like “I received your last memorandum.” Once in a while, though, a historian stumbles upon something truly fascinating. Often, historical research on the recent past involves visiting different archives and sifting through reams and reams of unimportant documents this is especially true for historians like me who are interested in the U.S. This is also true for the recent past, for which we have an abundance of printed sources, which are often housed in archives. ![]() We can use historical sources to reconstruct the past and try, as best we can, to figure out how different people in the past understood the world in which they lived, and how their world changed over time. Anything that was verifiably used or produced by people in the past can help reveal something about how they lived, interacted, and understood the world around them. These can be written sources, such as letters, reports, memoranda, or non-written sources, such as buildings, pottery, utensils, and a whole host of other things. Historical research makes use of the sources that people in the past created. A sieve storage rack is integrated into the support stand.One of the most thrilling aspects of a historian’s work is discovering something new in the archives. Separation is aided by tapping from hardwood-faced aluminum hammers. Mary Ann® Sifters are the original, popular laboratory tool and feature traditional enclosed plywood cabinets for safe operation.Floor stands are mounted on 4in locking casters for easy positioning in the lab. Silent Sifters have noise levels lower than any other rotary sifter on the market. They have been designed and constructed with special sound-reducing materials for enhanced worker protection. Gilson Silent Sifters® models feature all the quality design and construction of our Rotary Sifters.A side-mounted handle makes it easy to tilt the cabinet for testing. Heavy-duty commercial grade cabinet hinges allow easy access with wide-opening doors. A continuous-duty motor and premium grade bearings ensure trouble-free operation. Impact-resistant MDF board cabinets are precision machined and tightly sealed for maximum dust and noise control. Enhanced attention to safety features helps protect personnel. Gilson Rotary Sifters are built with high-quality components and materials for better performance and longer service life with heavy use. ![]() Selectable modes for timing allow the greatest flexibility. A pause function and one-button operation ensure repeatability. The digital timer with a large red LED display precisely counts down test times up to 99 minutes. Test sieves and drive mechanisms are enclosed by the cabinet. Silent models further reduce harmful noise levels by up to 18dB. ![]() The cabinet enclosure controls airborne nuisance dust and reduces noise. ![]() A safety switch stops operation when the door is open. When the test is done, the stack is removed, and sieves are ready for the weighing of sample fractions right away.īuilt-in safety features help to comply with OSHA standards. Sieve stacks are ready for testing as soon as they are placed in the cabinet. Capacity for 12in or 300mm sieves is from 6 full height to 13 half-height sieves. Sieve stack capacity for 8in or 200mm diameter sieves is 10 full height or 20 half-height sieves. Rotary sifters convert in seconds for 8in or 12in (200mm or 300mm) test sieve diameters.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |