( 600 J 
According to the programme six exposures were made, three of 
1, 2 and 55 seconds respectively on plates „Lumière bleue”, and 
three of 178, 55 and 1 seconds on plates „Lumière jaune”. During 
the long exposures a yellow light-screen was used with the object- 
ives V, en Vo. 
Exposure Nr. 1 is useless: owing to the strong vibration or jolting 
of the apparatus the image has been displaced on some plates by 
as much as 4’. 
Nr. 6 has also failed owing to direct sunlight. The long exposed 
plates all show the edge of the moon diffused, chiefly through 
irradiation and through the rather considerable motion of the moon 
(which amounts to lj, diameter in 55° and 1/3, diameter in 1785). 
The camera &, which was only added at the last moment, evid- 
ently was not sharply focussed. The only occasion to focus it was 
on the 17» of May, about eclipse-time. 
The camera D shows clouds on all plates; Plate Nr. 2 however 
is good, giving polar streamers to a distance of 10’, equatorial ones 
to 15’ from the moon’s limb; Nr. 3 and 4 are entirely fogged. 
The camera Vj shows only clouds and fogging. 
The camera Vs also shows clouds on all plates; the images are 
diffused by irradiation; Plate Nr, 3 is entirely fogged. 
The following summary gives for each of the 12 partly successful 
exposures the distance from the moon’s limb to which the corona 
is visible, expressed in minutes of arc. 
Nr. 2.| Nr. 3. | Nr. 4. | Nr. 5. 
| el | 
R 40 95 30 15 
D 15 25 30 15 
IT, „10-inch” coronagraph (Objective by STEINHEIL, 
j =_342 0m. — ASS. 
Three exposures (of: 2, 1 and 1 seconds respectively) have been 
taken on plates „Lumière jaune’, six (of 50, 5, 216, 5, 1 and 1 
seconds respectively) on plates „Lumière bleue”. 
The plates 1, 2 and 3 are fairly good though not perfectly sharp. 
The corona can be traced to distances of 10', 7.5 and 5.0 respect- 
ively from the moon’s limb, with prominences and structural detail 
of inner corona. N*. 7 also shows, besides many clouds, a few 
