TOTAL ECLIPSE OF THE SUN, APRIL 16, 1893. 
565 
In addition it was very important to attempt to secure records of the phenomena 
as nearly as possible at the beginning and end of totality. For this reason the series 
of exposures to which reference has been made were not commenced until an instan¬ 
taneous exposure had been made, and after they were completed four more plates 
were taken with short exposures, in the hope that one of them might be exposed 
within the two seconds preceding the end, the determination of the end of totality 
being less certain than of the beginning. 
A similar arrangement of exposures was made in the case of the photographs taken 
out of totality, the series in this case being 8 seconds, 2 seconds, and instantaneous. 
The spectrum was observed on the ground glass screen between the exposures, and 
seeing the great illumination of the field, I took upon myself at the last moment the 
responsibility of a small departure from the table drawn up and substituted two 
instantaneous exposures for the 2 and 8 seconds in Photographs Nos. 5 and 6, fearing 
that the longer exposures would fog the plates. 
Plates Obtained. 
A complete list of the photographs taken is given in the appended table. Column 1 
contains reference numbers to the photographic plates ; column 2 the brand of plate 
employed ; column 3 the times of beginning and ending each exposure, as recorded 
by a deck-watch ; and column 4 the amounts of exposure, “ Inst.” indicating an 
exposure given as quickly as possible by hand. 
