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Biographical Memoirs Volume 73 (1998) / Chapter Skim
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CARL DAVID ANDERSON
Pages 24-39

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From page 25...
... astronomer George Ellery Hale, Millikan establishec! the high stanciarc!
From page 26...
... This prize consistec! of a grant sufficient for two students to travel in Europe for six months, from March of their junior year to the following September, with an itinerary macle up largely of their own choosing.
From page 27...
... with Millikan's desire to work with cosmic rays, because, except for gamma rays from thorium C", these natural rays clo not have enough energy to produce positrons. Millikan hac!
From page 28...
... A particle passing through the plate loses energy en c! thus the direction of travel is uniquely cleterminecI.
From page 29...
... Geiger counters to various places so that he conic! use the earth as a giant magnet to analyze the energies of primary cosmic rays.
From page 30...
... WorIc! War II, Compton contacted Anderson and invited him to be the director of what soon became the atomic bomb project.
From page 31...
... physicists Charles Lauritsen en c! Willie Fowler on the Caltech artillery rocket project for the Navy.
From page 32...
... Today experimental work in particle physics is done almost exclusively with large particle accelerators. These machines now produce energies in the same range as primary cosmic rays.
From page 33...
... A preliminary report published in 1932 indicated that energies in excess of a billion electron volts were involved, and that approximately equal numbers of positives and negatives appeared in these cosmic ray showers. Even the relatively low energy positives, those with energy less than 500 mev had the same ionization track density as the negatives.
From page 34...
... Panama experiments encouragec! him to conclucle his Nobel lecture as follows: These highly penetrating particles, although not free positive and negative electrons, appear to consist of both positive and negative particles of unit electric charge, and will provide interesting material for future study.
From page 35...
... About ten faculty members signed, but the Caltech administration officially states! this was not Caltech policy.
From page 36...
... This was still the period when physics was being done with "love and string and sealing wax." Brilliant scientists with very little money or other support were pushing back the frontiers of physics and in the process giving us new concepts of the worIcI. Anclerson's "anti-matter" was the first step that lee!
From page 37...
... Cloud chamber observations of cosmicrays at 4300 meter elevation and near sea level.
From page 38...
... 38 BIOGRAPHICAL MEMOIRS 1947 With others. On the mass and the disintegration products of the mesotron.


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