276 MILLER— SPROUL OBSERVATORY ECLIPSE EXPEDITION. 



3. An Arch of the Skeleton Prominence. 



This prominence has five distinct arches on the equatorial side. 

 On the Pole side they are much less distinct, due perhaps to the 

 presence of another prominence beyond the edge of the sun. The 

 measures of the fourth arch from the prominence on the equatorial 

 side are shown in Table 3. 



Miss Powell found that on the average the recession of the arch 

 around the Southeastern Prominence is (assuming these measures 

 are correct) ninety miles a second ; that the recession of the arch 

 around the Pyramid is sixty miles per second and that the Skeleton 

 is receding fifteen miles per second. 



