History of an invention
  Comparison between compasses
The compass game
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  Simulation
 
 
 
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Biographies      
Galileo Galilei  
Cosimo II de' Medici
Baldassarre Capra      
Instruments      
Galileo's geometric and military compass  
Folding rule
Mordente compasses  
"Radio latino"
Military proteus (Museum of the History of Science, Oxford)      
Digital Library      
Galileo's Operazioni del compasso geometrico et militare  
Defence of Galileo Galilei... against the calumnies and pretences of Baldassar Capra
 
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