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1900s
DTM ACHIEVEMENTS TIMELINE
1940s
First World Magnetic Survey begun
Improvements to magnetic compasses and anti-submarine devices during WWI
1910s Determination of the height of the ionosphere by radio sounding
1950s
Studies of the strong nuclear force by proton-proton scattering
Discovery of cosmic-ray decrease during solar storms (Forbush Effect)
Development of the proximity fuze in WWII
1920s
1960s
Discovery of radio emission from Jupiter
Development of the tools for geochronology
1930s
1970s
Measurement of galaxy rotation curves and the discovery of dark matter
1980s 1990s
Tracing 10Be from atmosphere to mantle and back in arc volcanoes, F Tera et al., 1986
Defining the 4-D structure of a continent
Discoveries of extrasolar planets
Discovery of fossil seismic anisotropy in the mantle
First detection of slow earthquakes
Delineation of the connection between subduction and mantle plumes
Research vessel Carnegie, 1909
DTM survey party in the Australian Outback, 1912
Magnetic survey expeditions on land and sea
The Best of the Decade
JP Ault with marine collimating-compass, 1919
G Breit and M Tuve with radio sounding equipment, ca. 1925 [courtesy Library of Congress]
O Dahl, C Brown, L Hafstad, and M Tuve with 2-meter Van de Graaff accelerator, 1935
Correlation of cosmic-ray and magnetic field intensity, SE Forbush, 1938
Schematic of radio frequency proximity fuze for anti-aircraft defense, 1943
RW Carlson, SJ Hardy, JS Dunlap
News coverage of the first detection of planetary radio emissions, 1955
E Bolton demonstrating agar gel method for hybridizing DNA, ca. 1962
Discovery of repeated DNA sequences in the genomes of higher organisms
U-Pb concordia diagram developed by G Wetherill for determining mineral ages, 1955
Image intensifiers for telescopes
WK Ford with Carnegie image tube spectrograph at Lowell Observatory, ca. 1965
Optical and radio rotational velocities of the Andromeda Galaxy, VC Rubin et al., 1970-1975
Return of oceanic crust to mantle during subduction, AW Hofmann and WM White, 1982
Seismic and geochronological results from the Kaapvaal Project in southern Africa, 2001
Discovery figure for the giant planet orbiting 47 UMa, RP Butler and GW Marcy, 1996
Shear-wave splitting reveals anisotropy in the mantle, PG Silver and WW Chan, 1988
First installation of a borehole strainmeter in Japan, 1971
Strain record of a slow earthquake sequence in Japan, IS Sacks, AT Linde, et al., 1981
No 10Be in mid-ocean ridge, oceanic island, and continental basalts
10Be in island arc volcanoes
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