Smithsonian Report. 1940.— Nicholson 



Plate 1 



SATELLITES X AND XI OF JUPITER. 



J X. 1938, August 25. Exposure 31 min. Length of star trails 10". Image centered on plate. 

 J XI. Discovery plates, 1938, July 30. Exposure 60 min. Length of star trails 15". The image of the 

 satellite was 26' from the center of the plate on the upper reproduction and 29' on the lower. 



