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In honor of last week's #MinCup2020 winner #Magnetite, we're sharing this historic pic of @CarnegiePlanets (then Department of Terrestrial Magnetism) scientist Ellis A. Johnson collecting magnetite grains for early paleomagnetic studies. In 1938, DTM staff scientist Ellis A. Johnson and colleagues began the first American studies of the magnetic properties of freshwater and marine sediments. Magnetite grains in sedimentary rocks preserve information about the Earth's magnetic field at the time of their formation. As sediments settle on the floor of a body of water, naturally-magnetic minerals align the grains with the Earth's field. Through laboratory experiments in which clay was redeposited in a controlled magnetic field, Johnson et al. (1948) showed the relation between the applied field and the magnetization acquired by the sediments - a process geologists and planetary scientists known as depositional remanent magnetization. Photo and caption courtesy of Shaun Hardy, @CarnegiePlanets Librarian. #ThrowbackThursday #Tbt
The Library and Archives are located in the Abelson Building of the Carnegie Institution's Broad Branch Road campus in Washington, DC.
Books and periodicals in the earth and planetary sciences, physics, chemistry, biology, mathematics, and statistics are housed in the Main Library on the 2nd and 3rd floors of the Abelson Building. Current journals and special collections are shelved in the Reading Room. Reference works (encyclopedias, handbooks, atlases, etc.), laboratory safety information, and writing guides are located in A-208. A separate Astronomy Library in Research Building Room 272 holds materials in stellar/galactic astronomy and exoplanet research.
The Abelson Collaboration Center (ACC), located in A-208, has advanced audiovisual equipment and may be reserved for group meetings, presentations, classroom instruction, and videoconferencing
All borrowed library materials must be signed out. Only persons with formal Carnegie Institution affiliation (staff members, post-docs, pre-docs, interns, visiting investigators) are entitled to borrow materials. The honor system is used; please complete a sign-out card for each item you borrow and deposit in one of the boxes provided. When returning materials, place them on the cart next to the copier on the 2nd floor -- please do not reshelve them yourself.
Books and maps may be borrowed for extended periods, but are subject to recall at any time. Books marked "Reference Use" may not be taken out of the library, except by special arrangement. Current issues of journals do not circulate. They may be removed from the Reading Room briefly for photocopying, but then must be returned immediately. Borrowing of back volumes (bound or unbound) from the periodicals stacks is strongly discouraged; if necessary, however, these older journals may be signed out for a period of one week.