Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke3959.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 3959. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astronomy
History And Archaeoastronomy, Biographies
Scientific paper
David was an instrument-maker and astronomer, born in Paper Mill Run, PA, self-taught, as a young man he made clocks and telescopes, introduced the use of spider's webs as cross-hairs in transit telescopes and made orreries to show planetary motions. He used his own instruments for astronomy. He worked to survey the MASON and DIXON line and taught astronomy at the University of Pennsylvania. He b...
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