( 603 ) 
impressed, and are visible on the plate: On the middle of the plate 
however there is no trace of a spectrum; probably the plate has 
not been sufficiently displaced, and the corona has impressed itself 
on the strongly fogged part. In this part there are a couple of 
continuous spectra, in which G is shown asa dark line, not however 
at the proper distance (the moon’s diameter) from each other. Of 
the second flash spectrum there is no trace. | 
This plate also is not well developed. The width of the slit 
was !/5, mm. 
ITI. Spectroscope. 
In consequence of the cloudiness no trace of the spectrum of the 
corona could be observed with this instrument. 
IV. Objective Grating Spectrograph. 
As has already been mentioned, the grating-camera (f = 16 a) 
which was mounted at the northern limit of the path of totality 
has given no results. This is specially to be regretted since this 
locality was favoured by a very clear sky, and since, judging by 
the few crescents of the chromosphere which are shown on the spec- 
trograms, the instrument has been correctly adjusted. 
V. Prismatic Camera. 
This instrument (Cooke’s triplet, f = 260 em. = 17 a; two prisms 
of 45° with a total length of bases = 31.2 cm.) was fed by a siderostat. 
The plates (Lumière panchromatique) measured 16 16 cm, but might 
with advantage have been longer in the direction of the dispersion. 
A solar spectrum, photographed by means of a temporarily mounted 
collimator, showed the lines sharp along the whole length of the 
spectrum. The focussing was done the night before the eclipse by 
visual observation of the spectrum of Arcturus. 
According to the programme 5 exposures have been made of the 
first flash (plate 1), each of 3/4 seconds by estimation, viz. at the 
times — 28, 0s, + 28, + 58 and + 178, where 0 is the zero of 
counting. (It has appeared afterwards that the second contact, 
which was hardly visible through the clouds, has happened at the 
time — 3s). After this four long éxposures were taken (plates 2—5) 
by which it was hoped corona-rings would be photographed ; these 
exposures lasted 5, 20, 190 and 60 seconds respectively. Finally 
(plate 6) again 5 exposures of the flash were made, each of about 
ò/4 seconds, at the times 2s, 45, 68, 88 and 10s after third contact. 
