Results for "Astrophysical observatories"

1. 

   One of the Instruments Used to Determine Sunlight Intensity and Sky Brightness

   • Date: 1930 Between 1930 and 1934

2.  
3. 

   Solar Cooker at Mt. Wilson, California, Cooks Food by Sun Heat

   • Date: 1920 Between 1920 and 1934

4.  

Pages

• « first
• ‹ previous
• 1
• 2