Results for "Observatories"

1. 

   Secretary Charles G. Abbot with Bolometric Apparatus

   • Date: 1900
   • Creator: Unknown
   • Creator: Unknown

2.  
3. 

   Secretary Abbot with Solar Equipment

   • Creator: Unknown
   • Creator: Unknown

4.  
5. 

   Secretary Charles G. Abbot Reading the Pyrheliometer

   • Date: c. 1940

6.  

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