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Pennsylvania shelf and bracket clocks 1750-1850
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2. Isotopic clocks
2. Isotopic clocks
About one in a trillion atoms of carbon is the radioactive isotope 14C. It is a ‘cosmogenic isotope’ produced by the interaction between atmospheric nitrogen (N) and cosmic rays. T...
11. Cosmic stopped clocks
11. Cosmic stopped clocks
‘Cosmic stopped clocks’ explains how, using isotopes that are the daughters of isotopes that no longer exist, isotope geochemistry has been able to assemble a chronology for the fo...
The ancient Greek world
The ancient Greek world
Donald White, University of Pennsylvania, December 1995, Univ Museum Pubns...
American sculpture in the Museum of American Art of the Pennsylvania Academy of the Fine Arts
American sculpture in the Museum of American Art of the Pennsylvania Academy of the Fine Arts
Pennsylvania Academy of the Fine Arts. Museum of American Art....
The Pennsylvania Academy and its women, 1850-1920
The Pennsylvania Academy and its women, 1850-1920
Pennsylvania Academy of the Fine Arts....
Census Data for 1850 and 1860 and the Defeat of the South
Census Data for 1850 and 1860 and the Defeat of the South
This chapter discusses how census data for 1850 and 1860 contributed to the military defeat of the South in the Civil War. For instance, the main innovation of the 1860 census was ...